Top 10 Best Drone Without Camera

FAA-Compliant Remote ID The Holy Stone HS720 4K drone has completed the FAA requirement. No need extra remote ID module. Enjoy worry-free flights, ensuring safety and compliance.. 4K UHD Camera with Image Stabilization The optimized full HD Camera built with Shock Absorption holder ensures shooting 3840 x 2160 high-resolution images and videos without camera vibration. 5GHz FPV transmission and 90adjustable lens enable you to see the world from different angles.. GPS Assisted Intelligent Flight Never lose the drone. It returns automatically whenever battery is low, signal is lost or you press one key return. Also, it is so smart to fly at your will, following you automatically, flying along a path you set, or fly around a point in circles. You may focus on your photography and creation.. Configuration Upgrade The 2 intelligent batteries works for 26 Minsper battery for each charge 52 Mins in total with 2 batteries the long-life Brushless Motors have lower power consumption and give you a quieter flight the foldable design and well-fitted carrying case make it easy to take the drone outdoor. DON'T use batteries from other brands, which may cause product issue or safety concern PRODUCT SUPPORT AVAILABLE. Simple Operation Equipped Multi Sensors guarantee hovering with great stability and high quality pics taken under different flying environment Optical Flow Positioning makes great effect when GPS signal is lost or weak. Functions, like one key startstop, emergency stop, altitude hold and electric fence, keep it simple to control for even beginners.. Considerate Controller The control range of 2.4GHz transmitter reaches to 3000 feet high range battery level and GPS signal shown on the LED screen a button to turn on or off the drone light is added right hand throttle mode is available for left-hander. Remember to remove the scratch-proof film from the controller and the camera before use..

FAA-Compliant The Holy Stone HS720E drone with camera 4K has completed the FAA requirement. You can now obtain the Holy Stone to ensure compliance. Reach out to the Holy Stone Customer Support team for assistance with any Remote ID Module inquiries.. 4K EIS Anti-Shake Camera with Sony Sensor HS720E GPS drone boasts a cutting-edge 4K3840 x 2160 camera with Electric Image Stabilization EIS technology, ensuring crystal-clear videos free from blurring. Equipped with an advanced Sony Sensor, the HS720E drones with camera for adults 4k elevates image quality to unmatched levels, outperforming others in its class.. Seamless Outdoor Flight Experience stable flight, thanks to the integrated air optical flow air pressure altitude control system. With GPS location and Auto Return to Home functionality, you can explore with confidence, knowing your HS720E FPV drone will always find its way back to you.. Extended Flight Time Elevate your airborne adventures with our Fly More Kit, providing a total flight time of 46 minutes with two intelligent batteries. Spend more time soaring and less time recharging. The included Carrying Bag adds convenience, making it a breeze to transport and store your HS720E 4k drone when not in use.. User-Friendly Controls Elevate your videography and photography with innovative flight modes such as Follow Me, Tap Fly, and Point of Interest. Watch your HS720E mini drone with camera effortlessly navigate while you focus on capturing stunning shots and videos.. Whisper-Quiet Power Equipped with brushless motors, the Holy Stone HS720E camera drone for adults ensures powerful, stable, and virtually noiseless flights. Experience the thrill of soaring through the skies without the distractions of motor noise, all while benefiting from extended motor lifespan and minimal maintenance..

1080P FOV 120 HD FPV Camera You can capture memorable moments with distortion-free and view images on your phone from the wide-angel lens. The app enables you to expand your creativity further and share it on social media with ease.. Altitude hold When you focus on shooting images, you may set your hands off the joystick and the drone still suspend in mid-air with locked altitude. A perfect drone for beginners, kids, starters, or newbies to have a easy and stable flight experience.. Headless Mode The pilot will feel easier to control, especially when the drone is out of sight, under headless mode while the orientation of the drone is in relation to the pilot. The drone are also equipped with 3D flips to make your day.. Mobile Control Through the APP, multiple functions, Voice Control, Gestures Control, Trajectory Flight and Gravity Sensor Control can be activated. Instruct the camera to take photos by gestures of Scissor and videos by Paper.. 2 Modular Battries 2 batteries can support a 20 Minutes flight which makes it easy to replace battery and safe to charge battery..

4K Camera with 5G FPV TransmissionThe top rank of camera drones for adults. The UHD 4K camera captures your wonderful moments with incredible details the 120wide angle lens and remote-controlled 90adjustable structure broaden your view, and the 5GHz FPV technology guarantees longer and smooth image transmission.. Intelligent Flight Features GPS drones for adults, multiple GPS functions such as Follow Me, Waypoint Flight, Tap Fly, and Point of Interest enable the drone to fly automatically and free your hands. The whole family can enjoy the creative fun of flight together.. Easy to fly Altitude Hold makes the drone hover in the air without throttle control Smart Return to Home and Emergency Stop free your minds of losing the drone One Key Take Off Landing help get the hang of it quickly and easily. A perfect drone for beginners. Triple Stability GuaranteeThe GPS and GLONASS dual-mode global positioning system combined with Optical Flow Positioning keeps the drone hover extremely stably in the air both indoors and outdoors.. Lasting and Powerful It holds a position quite stable even in wind with the powerful Brushless Motors better than other competitor drones A safer modular batteries are convenient to use, which increase the flight time up to 25 minutes. The portable and foldable structure is designed for your convenience and brings longer-lasting fun to you and your family.. Professional DroneFor professional personnel, HS710 is undoubtedly a reliable professional drone with camera, 4K camera lens, high-definition picture quality, GPS intelligent function, optical flow positioning, all will enhance your flying experience.. Super Lightweight No need to make FAA registration and effectively reduce your travel burden thanks to the weight control of HS710 drone Less than 0.55LB..

4K Ultra Clear Camera 4K camera with 110 wide-angle and 90 adjustable provides a high resolution picture, enable to capture a perfect shot 5GHz FPV transmission delivers a smooth and stable videos even in high-speed or strong-wind conditions. GPS Auto Return GPS assisted flight, it can perform automatically return home when the drone lost signal, out of range or low power, never have to worry about flying it away. Better Flight Experience 2 batteries give you up to 46 minutes flight experience. And functions like Altitude Hold, Optical Flow, Headless Mode, One Key Take OffLanding and Speed Adjust make it so easy to beginners or newbies.. Considerate Design This drone comes with a carrying case, and the foldable fuselage design allows it easy to store and more portable for outdoor travelling, weight under 250g to save you from FAA registration.. More Intelligent Functions This drone can trace and follow you automatically, flying along a path you set, or fly around a point in circles, and when you pose to the camera it will take a photo or video, let you enjoy the wonderful flight experience..

1080P HD Auto-Adjustable Camera Equipped with a 1080P HD camera that can be adjusted within 90 by your remote control or the app, this drone can give you an exciting experience of aerial scenery from the 112 wide-angle lens, and assist you to catch every wonderful moment from a birds-eye perspective. Whether youre shooting at a deserted beach or capturing the details of a fun family reunion, HS440 can handle it all.. Sweet Air Time Enjoy an extended flight time of up to 20 minutes with the powerful modular battery and capture and explore more of your surroundings.. Small But Mighty Thanks to intuitive and advanced features packed in a foldable frame, HS440 provides complete freedom wherever and however you want to create. In addition, its equipped with a carrying case which is very helpful for you to move the drone from one place to another. Explore your world without limitations.. Simply Operation for Stunning Content HS440 carefully optimizes user experience and intelligent features. Thanks to automatic takeoff, and precise hovering, operation is more streamlined and safer than ever. One-Key High-speed Rotation would bring more fun amid flight. The possibilities are endless when the sky is your playground.. Discover a New Adventure HS440 is a must-have for beginners with its intelligent functions such as Emergency Stop, Headless Mode, and Altitude Hold as well as its user-friendly features such as its long flight time for every practice..

720P HD FPV camera The mini drone is equipped with a 720P HD FPV camera including adjustable angle, which captures high-quality video and clear photos by specific gestures, as well. The WiFi Real-Time Transmission can broaden your view. Photography is easy as pie.. Straightforward Operation With the help of One-Key Start and Altitude Hold, the drone will take off and hover at a certain height. In the Headless Mode, you can operate the drone easily without the loss of direction. Emergency Stop can prevent most urgent situations. Flight has never been this easy.. More Fun Features The drone can be Tossed to Launch, it can perform stunts like 3D flip, Circle Fly and High-Speed Rotation. You can customize a flight path through the APP and the drones flight path will follow the one you draw. Whats more, High and Low-Speed Modes make the drone fit with both experienced and novice pilots. The joy of flight is endless.. Two Batteries Double Fun 2 Modular Batteries extend your flight time and guarantee enough time for you to enjoy the splendid flight. Moreover, the modular battery is much easier to change and far safer to charge. Free flight without endurance anxiety.. Mini and Portable You can take this Pocket-Size drone to wherever you want to go, which only takes tiny space in your pocket or bag. The propellers are completely wrapped by the protection guards. Kids wont be hurt by running propellers. Taking it to the party, school, fishing, hiking, or long journey would be an extremely great idea. Seize every wonderful moment.. Note When using multiple drones at the same time, please be sure to power on and pair each drone and remote control separately to avoid frequency confusion caused by powering on multiple units simultaneously..

- Enjoy worry-free flights with Holy Stone HS720G drone which built in , ensuring safety and compliance. The HS720G Gimbal drone with camera has completed the FAA requirement. No need extra remote ID module.. 2-Axis Gimbal with 4K EIS Camera With 2-axis motorized gimbal and 4K EIS Electric Image Stabilization Camera, HS720G FPV drone guarantees stunning and vivid footage in a bird's-eye view without missing any details. Its your ticket to the sky.. High-tech Outdoor Performance The powerful brushless motors and a max battery life of 26 minutes ensure HS720G drones for adults stable flight and having enough time to compose the perfect pictures. The maximum distance for remote control reaches 999 meters.. User Friendly Multiple functions such as Headless Mode, Automatic Take-off, Altitude Hold, Optical Flow Positioning are devised for the novice. Being a drone pilot has never been this easy.. Powerful GPS Module The GPS module and Optical Flow Positioning make HS720G camera drones safer, more reliable and have extraordinary anti-interference capabilities, offering you the ability to fly farther and more stable. You can have a blast outdoors with your kids or friends without disturbance and restrictions of distance.. All-Round Functions Follow Me, Tap Fly, and Point of Interest grant HS720G wifi fpv drone performance intelligent flights, freeing your hands up. Your perfect memories will start right when you switch on the HS720G.. Never Losing the Drone The Emergency Stop, Smart Return to Home, GPS module and One Key Return can prevent HS720G 4k drone from losing to a great extent. Dont hesitate to take it home.. Great Travel Companion The intuitive and advanced foldable design of HS720G gps drone and the carrying case ensure the pilot complete freedom to wherever he wants to go. Less than 380 gram, the weight of HS720G is as much as a can of coke. HS720G can definitely be the ideal travel companion..

Extremely Lightweight, No FAA or Remote ID Registration HS360S, drone with camera for adults featuring the Holy Stone latest design, weighs less than 250g this GPS drone offers the perfect solution for hassle-free flying in the States without FAA or Remote ID registration. Perfect for capturing stunning footage on the go.. 4K UHD Camera with GalaxyCore Sensor Holy Stone drones with camera for adults 4K equipped with 13'' CMOS GalaxyCore Sensor and 4K 85 wide-angle Camera adjusted within 90 by remote control or the app, captures stunning 3840x2160P photos and 4K videos. Unleash your creativity from a whole new perspective.. Advanced Connection Technology HS360S, a GPS drone with camera, features Holy Stone's enhanced remote controller. Now you can connect your smartphone to the controller using just one data cable, and enjoy real-time image streaming without the necessity of WiFi Set the social media stage on fire with stunning visuals from the Holy Stone HS360S GPS 4K drone with camera.. 10,000 Feet Long Range Transmission Thanks to Holy Stone Advanced Intelligent Control System, The control range of HS360S, drones with camera for adults 4K, is up to 10,000 Feet. The Powerful Modular Battery supports 20 minutes of flight. Experience the freedom to explore like never before with Holy Stone Drone for Adults.. Powerful GPS Function Holy Stone HS360S, drones with camera for adults 4k, features precise GPS positioning, providing not only stable flight but also a safe return home. This GPS drone can perform Return-Home Function to find its way back to you when battery runs low or the connection breaks up. Let this 4K drone roam free and bring it back with ease whenever you're ready.. User Friendly, Upgraded Holy Stone Control System With the latest Holy Stone Intelligent Control System, HS360S drone with camera provides beginner mode and optical flow positioning to help you practice the drone control skill. Holy Stone GPS 4K drone is easy for the Novice.. Multiple Stunning Functions HS360S drone with camera for adults makes aerial filming easy for you with intelligent recording modes like Spiral Up, Catapult and 1-Tap Ascension, all you need to do is tap once, and this 4K drone with camera does the flying and filming for you Functions like Follow Me, Waypoint Flight and Point of Interest can enhance the flying experience.. Never Stop Upgrading Holy Stone HS Fly App would keep improving the functions of HS360S GPS drone to help you enjoy the ever-improving flight experience and shooting quality. Contact Holy Stone anytime if you have any drone issues. Holy Stone support is always available to assist you with the drone issue..

Compact Portable X700 drone has a compact, foldable design that makes it easy to carry and transport wherever you go. Perfect for on-the-go excitement. User Friendly The drone for kids can do auto-hovering with Altitude Hold, while One Key StartStop lets you take off and land like a pro. And with 2 speed modes, from low to high, it's perfect for pilots of all levels. Kids Stunt Drone This rc drone is like having your very own stunt plane With the ability to do insane 360 flips and lightning-fast high-speed rotations, you'll be the envy of all your friends.. Long Flight Time Unleash the fun with this amazing remote control drone With two batteries providing a total of 24 minutes of flight time, kids can safely swap them out for extended playtime.. Ideal Gift for Kids and Adults Helicopter is suit for Indoor Outdoor flight, plus 2.4Ghz remote control system supports multiple players can enjoy flying this mini drone at the same time..

Drone Car 2 in-1 Design Exclusive advanced design, When you press the switch button, the drone indicator light will show green, which means flight mode when you press it again, the drone indicator light will turn blue, which means the kids drone is in car mode. It can be used with the base to travel smoothly with other racing cars. Let your child have the feeling of running a racing car and flying a quadcopter at the same time.. Car Mode We have equipped this rc helicopters with a base. It's so cool Press the transform button to make the indicator light on the drone turn blue. At this time, you can control it to move forward and turn left and right because the tail fan blades provide power, it cannot go back directly, please turn first. The smooth base with three-speed gears is suitable for most household carpets without worrying about resistance.. Multi-functional and User-Friendly This dron has one-click takeoff landing, stable altitude hover, 360-degree roll, flexible headless mode, and fine-tuning functions. The intelligent chip allows you to control it to fly in various environments at will. Whether you are a beginner or an experienced person, you can quickly start playing. The default initial speed is first gear, speed up according to your needs. Come with 2 batteries and extra blades, cable fits your needs.. Durable Quality and Longer Battery Life Using high-quality environmentally friendly materials makes the body more durable, and withstand countless bumps or drops. The four fan blades are wrapped for good protection, protecting your child from physical harm caused by spinning propellers. 2 batteries provide up to 20-30 minutes of battery life 20 minutes in flying mode, 26-30 minutes in car mode, longer using time than competitors.. Perfect Present 100 After-Sales Service As an exclusive two-in-one drone car quadcopter, this toy is much more playable than similar products and will be the best car drones for kids. We provide 100 after-sales service. If the product you receive is defective or you encounter problems during use, please contact us in time and we will provide you with online services, including user guidance, reissue, and refund.. About Operation After the remote control and the drone is turned on, you need to move the left joystick up and down to link the frequency. At this time, the drone's light turns blue, which represents car mode. You need to fold the drone's tail and use it with the car base. You can go forward, turn left, and turn right. Click the switch button on the remote control, and the drone's light will turn green, indicating flight mode. You need to keep the drone's tail flat for use..

12 48MP CMOS Sensor The upgraded 12 48MP CMOS sensor, bringing a large 1.6um pixel size based on the Quad Bayer pixel technology, can effectively reduce noise during nighttime aerial filming. Built-in native exposure control with signal processing technology ensures a 4X higher dynamic range than that of traditional CMOS sensors.. Super Night Scene Shooting Based on multi-frame fusion noise reduction technology and the large aperture of the 12 sensor, the FIMI X8SE 2022 V2 ensures that the camera will capture at night the details you need to create your blockbuster.. Megaphone Once mounted onto the drone, the device can remotely transmit voices or sounds. It can also store multiple audio files, support text-to-audio, and automatic loop playback, and shout in real-time. With a max transmission range of 100 meters, tasks such as search and rescue are quicker and easier than ever before. The range depends on the circumstances. In complex environments with noise, the best range is within 50 meters. The maximum control distance of the megaphone is up to 10 km.. Release and drop The device can carry and drop a payload of up to 200g, allowing the drone to fly over obstacles and deliver urgently needed materials. The payload should not exceed 200g, and the smaller size of the load better the drone will handle the flight. Note that when carrying a load, the drones speed and deceleration distance are affected.. RokLink 10km Transmission System The upgraded 3rd generation RokLink high-definition digital image transmission system with adaptive stream-encoding technology provides a superior transmission distance of up to 10km and transmission delay as low as 130ms, helping you explore and capture the beauty of greater distances.. 3-Axis Mechanical Gimbal The 3rd generation of the LOS stabilization algorithm, a sensor with high precision control and an accuracy of 0.005, and a fully closed loop servo system all contribute to perfectly eliminating jitters in real-time, allowing you to enjoy silky smoothness in your blockbusters. Level 8 Wind Resistance The power system, combined with the lightweight design of the drone, brings a higher thrust-to-weight ratio and supports up to Level 8 wind resistance.. Remote ID Thanks to integration of Remote ID, the FIMI X8SE 2022 V2 provides safe and legal flight experiences around the globe, meeting both FAA and EASA flight requirements.. Rainproof and Snowproof Designed to be rainproof and snowproof, your flights will no longer be affected by the weather. Even if you encounter rain or snow, you can still fly safely and have the drone return home without worry.. A Large F1.6 Aperture The larger aperture of the FIMI X8SE 2022 V2 allows for more light to come through, effectively reducing noise. With greater light sensitivity, it accurately captures more colors and details during low-light videography..

HD 1080P Camera The drone features a 90adjustable lens, a 1080P high-definition WIFI camera, and FPV transmission, allowing you to seamlessly view real-time footage captured by the drone in the sky on your phone.. Easy to Get Started The drone with one-key take offlanding, headless mode, altitude hold, and three-speed settings. Equipped with a propeller obstacle avoidance, and 2 batteries, the flight can last up to 30 minutes. Even beginners can quickly get the hang of flying and enjoy the experience.. Rich and Entertaining Features The drone has 360 flips function, you can enjoy showing stunts in the sky. Connect with your phone to experience gesture photography, VR mode, and even let the drone fly out of your designed route through trajectory flight. Foldable and Portable The drone with camera is undoubtedly your best outdoor partner, it comes with a collapsible has a carrying case and weighs less than 249g, no FAA registration is required. Its compact size makes it easy to carry with you wherever you go, allowing you to play anywhere.. Best Gift Choice The drone has a cool appearance design, three camera appearance. Multiple ways to play, simple and easy to operate, it is the best gift for drone lovers, and curious and exploratory adults and kids. Product After-sales Service We provide 24-hour after-sales service for the drone. If you encounter any issues, feel free to contact our customer service. We also offer replacement propellers for sale to ensure your long-term enjoyment..

LIGHT UP THE SKYBright LEDs on the Q9s drone emit vibrant neon GREEN BLUE light throughout its entire frame, providing you with a powerful illuminating effect and a vivid flight experience.It also has three different display modes for lighting. We believe that it will surprise you all. SECURE DURABLEThe structured style and FOUR sturdy propeller guards ensures a secure flight which protects your kids to avoids body injury from spinning propellers. High quality ABS material to withstand countless crashes or drop. Very durable and reliable drone for Kids and Beginners. User Friendly1You can simply take-off land return the drone with one button. 2Three speeds for you to choose, No matter beginners or skilled players. 3You have no worry about identifying directions Under headless mode. 4The altitude hold feature allows your drone to hover automatically in the air. Even if you do not do anything with the controller All these features make the drone extremely beginner-friendly.. Double flight TimeComes with 2PCS batteries.Player will have more time for fun.. Multiple Operating TricksFeaturing with 360 degree Flips and Auto-Rotation Functions to enrich your flying experience.Good toy for kids..

Lightweight and Compact Mini 3 weighs under 249 g. Perfect for taking with you on your adventures, from hikes, road trips, and beach days.. Extended Battery Life With up to 38 minutes of battery life, you can take Mini 3 out at every stop along the way or fly long flights without worrying about the battery.. Stunning Imagery Film in 4K HDR Video for crystal clear aerial shots. Capture details in highlights and shadows, both day and night.. Capture Height, Be Social With True Vertical Shooting, you can easily capture tall landmarks like skyscrapers and waterfalls. And after capturing, it's in the perfect orientation to post to Instagram or TikTok.. Focus on the moment Epic shots are at your fingertips. Use QuickShots to choose dynamic flight patterns or capture a stunning view with Panorama.. Flying is a Breeze Don't let a little wind get in your way. Mini 3 is resistant to 38kph winds level 5, so you can stay steady and capture your shot.. With two additional Intelligent Flight Batteries, a Two-Way Charging Hub, and a shoulder bag, you're ready for extended adventures. This combo includes the new DJI RC, which has the DJI Fly App pre-installed and a built-in 5.5-inch HD display.. DJI Mini 3's flight time can be extended up to 51 mins with the Intelligent Flight Battery Plus sold separately and only in select countries, but the aircraft will weigh more than 249 g..

Altitude Hold Function Powerful air pressure altitude hold function allows you to release the throttle stick and the drone will keep hovers at it's current height.. Foldable and Easy to Carry This mini quadcopter can be folded into the controller, which is small and easy to carry.. One Key Take off Landing Drone automatically hovers at a set altitude after take-off and before landing making it easy to control and maneuver, especially for beginners who are not yet skilled.. Headless Mode and One Key Return Enable players of any level to fly and operate the drone easily One Key Return press this button in Headless Mode, the drone will automatically come back to you.. High Speed Rotation New and interesting function. The drone can do 360 circle and fly at high speeds, offering you a special and exciting feeling..

DJI USA AUTHORIZED - INCLUDES FULL USA WARRANTY EXCLUSIVE 2 Year Extended Warranty - Mini Size, Powerful Imaging - DJI Mini 3 features an extended battery life, 4K HDR video, and intelligent features to capture stunning aerial imagery effortlessly.. Under 249 g Extended Battery Life 4K HDR Video True Vertical Shooting Intelligent Features 38kph Level 5 Wind Resistance Beginner-Friendly, Easy-To-Fly, and Easy-To-Use Stunning Footage at All Hours - With a 11.3-inch sensor and dual native ISO, Mini 3 can record 4K HDR videos with true-to-life colors both day and night.. Amazing Results, Effortlessly - An innovative gimbal design allows for a large-angle camera tilt and True Vertical Shooting. Get even more dynamic angles with QuickShots. Packs Light for Adventures - DJI Mini 3 is foldable and weighs under 249 g. It's easy to take on trips and can fly in most regions without registration.. Go Far With 10km Transmission - DJI O2 video transmission provides strong anti-interference and transmits up to 10 km, so you can travel long distances securely. 51-Min Extended Flight Time - DJI Mini 3's flight time can be extended up to 51 minutes, making it the longest-lasting DJI camera drone thus far.. BUNDLE INCLUDES DJI Mini 3 CP.MA.00000613.01 RC Remote Controller With Screen Intelligent Flight Battery 3 Two-Way Charging Hub Spare Propellers Pair x 3 Type-C to Type-C PD Cable USB-C Cable Spare Screws Screwdriver Gimbal Protector Shoulder Bag CPS 2 Year Extended Warranty Deco Gear Drone Photography Travel Backpack for Drones Lexar microSDHCmicroSDXC UHS-I 32GB Memory Card.

Fun Tricks This mini portable buddy can do Toss to Launch, 3D flips, Auto Rotation and Circle Fly boys girls love these functions Speed adjustable. Suitable for indoor or outdoor flight. Small body, big fun. Auto-hovering Altitude hold enables the quadcopter to hover at current height. Start or land with one key which makes this pocket toy easier to play. Super stability under your control.. 21 Minutes Flight Ultra-long battery life extends your flight experience. With 3 rechargeable batteries which beats over any other drone on the market.. Headless Mode Have fun with the nano drone without worrying about what direction it is facing, especially when it is out of your sight.. Low Battery Alarm No worry losing it. The full protection guard protects toddlers hurting. Fairly safe to play it with your family or friends. Great gifts for children, teens, plane fans.. Note When using multiple drones at the same time, please be sure to power on and pair each drone and remote control separately to avoid frequency confusion caused by powering on multiple units simultaneously..

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