Top 10 Best Door Ringer

No Monthly Fee Family SharingBreak free from endless subscriptions Select Mubview Wi-Fi doorbell camera, saving videos in lifetime-free cloud service 7-day loop recording or micro SD card not included. AES256 encryption ensures secure playback, recording and sharing. Multiple mobiles can be connected with the same smart doorbell camera, allowing whole family live video viewing and communication with visitors. Multiple security cameras can be even managed in one appCloudEdgeMubview. Sharp Video Night Vision Two-way AudioWith a built-in microphone and speaker, you can see, hear, and talk with couriers via a 1080P door bell camera. Door bell ringer wireless features a 120 wide angle, and 33 ft night vision, ensuring clear views in darkness. Doorbell with voice changer offers safety and privacy for single women in apartments. Pre-recording voice messages help the disabled effectively interact with visitors. More than convenience it's about freedom and peace of mind. Enhanced Human Detection Instant AlertsGet real-time alerts, interact with visitors, scare away thieves with a loud siren and know package delivery when video doorbell without subscription detects motion at your doorstep. With AI human detection and adjustable sensitivity, this camera doorbell wireless minimizes false alarms and unnecessary notifications. Set customizable motion zones and schedule alert time easily with our user-friendly app for a tailored doorbell cam with chime experience.. Stable Connection Long-lasting Battery Low Battery WarningWith the addition of the upgraded 2023 chip, the video doorbell camera achieves a remarkable threefold increase in network connectivity smoothness, effectively reducing disruptions. Never miss a visitor wherever you are. work with 2.4GHz WiFi, not 5G. Our rechargeable doorbell has a lengthy 90-day battery life per charge. Low battery alerts and battery indicators ensure timely charging, keeping the door camera always functional..

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 2 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Truly reliable and weather proof, will operate between temperatures of -4F to 140F.. VERSATILITY Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management, there is always a good use for SadoTech.

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 2 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Truly reliable and weather proof, will operate between temperatures of -4F to 140F.. VERSATILITY Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management, there is always a good use for SadoTech.

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 1 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Truly reliable and weather proof, will operate between temperatures of -4F to 140F.. VERSATILITY Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management, there is always a good use for SadoTech.

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 1 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Truly reliable and weather proof, will operate between temperatures of -4F to 140F.. VERSATILITY Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management, there is always a good use for SadoTech.

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 1 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Truly reliable and weather proof, will operate between temperatures of -4F to 140F.. VERSATILITY Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management, there is always a good use for SadoTech.

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 1 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Truly reliable and weather proof, will operate between temperatures of -4F to 140F.. VERSATILITY Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management, there is always a good use for SadoTech.

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 1 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Truly reliable and weather proof, will operate between temperatures of -4F to 140F.. VERSATILITY Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management, there is always a good use for SadoTech.

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 1 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Truly reliable and weather proof, will operate between temperatures of -4F to 140F.. VERSATILITY Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management, there is always a good use for SadoTech.

5 Modes Motion Sensor AlarmNot only serves as a motion sensor to detect alerts but also has other functions. Welcome Doorbell Alarm Color light Lighting Model. Motion detectors are essential in a home security system. Doorbell chimes can detect movement in the surrounding areas - driveways, front porches, gates, homes, sheds, offices, walkways, swimming pools, stores, etc. And trigger an alert to the linked receiver.. 36 Ringtones 5 Welcomes Doorbell Rings Languages5 welcome languages are selectable in welcome mode. 36 ringtones selectable in doorbell mode. WelcomedoorbellAlarm model has 4 level volume adjustable. Color light Lighting mode is silent and has 4 levels of brightness adjustable. Great for people with hearing disabilities or if there is a sleeping baby in your house. The color light model also has 4 colors selectable.. Sensitive Wide Wireless RangeThe motion sensor doorbell entry alert door chime for business stores catches movement from a broad scope of space, with a working Range of up to 280m918ft between the receiver and motion sensor. The detection range of the infrared sensor is approximately 2-8m7-26ft to keep you informed and safe. You can put the motion sensor detector on the porch, gallery, or mailbox and put the receiver in your house.. Expandable Wireless Home SecurityFlexible design according to your actual needs. You can choose the quantity of transmitter and receiver you like, which can be freely matched and set special lights or ringtones with each other. Each receiver of this motion sensor alarms for elderly an alarm and can work with 32 motion sensors and 8 remotes at most. While wireless door chime entry alert commercial is suitable for outdoor applications, please note that it is not waterproof.. Easy to Install UseThe wireless doorbell can be used by connecting USB port or installing it with batteriesinfrared sensor needs three AAA batteries and receiver need three AA batteriesto make it work. Both the infrared sensor and the receiver have a mounting base. The motion sensor doorbell can be rotated 360 degrees from left to right and 180 degrees from top to bottom. So easy to install and can rotate to any position you need..

PAIRS CONNECTS EASILY FOR quick, frustration-free installation anywhere in your home. WHILE OTHER doorbells wireless are DIFFICULT TO SET UP or DONT WORK CONSISTENTLY, door bells by SadoTech extend OVER 1000FT of RANGE in open areas are PROVEN TO WORK THROUGH DOORS WALLS. Great for large homes, apartments, offices warehouses. And with BATTERY LIFE of UP TO 3 YEARS, youll never miss a chime Use as door chime for business when entering or classroom doorbell for teachers. THIS WIRELESS DOORBELL KIT IS the perfect starter for any wireless door bell user. KIT CONTAINS 2 wireless doorbell transmitters and 2 plug in smart doorbell receiver, double sided mounting tape, anchors, screws and A23 BATTERY INCLUDED. Sleek, modern LED INDICATOR lights illuminate both transmitter receiver can be set at 4 VOLUME SETTINGS, from low for naptime to high during a party. Our extensive COLOR SELECTION means youll find the right door bell push button to suit your style.. BUILD THE ULTIMATE SMART door bell system With multiple wireless door bells you can CONFIGURE each door with A DIFFERENT CHIME or ringtone. KNOW EXACTLY WHICH DOOR your visitors are calling from. For homes or offices with multiple entry points, this is CONVENIENT TIME-SAVING. Youll soon wonder how you lived without it. And UNLIKE SOME OTHER doorbell wireless, this door bell by SadoTech is truly WATERPROOF WEATHERPROOF to -4F140F for a system that lasts for years to come.. OUR PATENT-PENDING SOUND CHIP holds the LARGEST SELECTION of classy, high-quality ding-dong chimes, NO TINNY, ANNOYING ringtones. With 52 TOTAL RINGTONES at 4 VOLUME LEVELS, youll feel good knowing our ring chime MEMORY CHIP STORES your chosen doorbell chime selections even when unplugged or turned off. LISTEN FOR YOURSELF Just SCROLL DOWN to the Technical Specs section below click the Specification Sheet link to DOWNLOAD the PDF. Open the PDF and play all 52 ringtones.. AT SADOTECH, OUR GOAL IS to provide INNOVATIVE, HIGH-QUALITY PRODUCTS at a price everyone can afford. QUALITY IS KEY We love that our products bring ADDED SECURITY, CONTROL peace of mind to you, our customers. NEED SPARE BATTERIES, extra add-on buttons, receivers, sensors or a CUSTOMIZED DOORBELL button Visit our store www.amazon.comsadotech. If, for any reason, you dont love your wireless doorbells by SadoTech, reach out and WE WILL MAKE IT RIGHT..

WIRELESS DOORBELL KIT Includes everything you need for DIY installation 1 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws. An A23 battery is included and will last for up to 3 years.. EASY TO SETUP Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting frommore than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties.. LONG RANGE Our patented technology uses the highest quality microchips and does not need wifi or bluetooth. The signal from the wireless bell ranges up to 1000 feet. Great for large homes, apartments, offices, and warehouses. U.S. Pat. No. D800005. SMART TECH Not only have we made the traditional door bell ringer wireless, but we made it smart too. It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night.. RELIABLE Our wireless door bell will work through snow, rain, or sunshine. The strong body of our battery doorbell is truly weather proof and will operate between temperatures of -4F to 140F while combatting the elements for years to come..

SIMPLE SET UP Just plug the mini receiver into a socket and fix the transmitter on a wall with the accessories provided includes 2 screws, 2 anchors, a key and a piece of double-sided bonding tape. 300 M1000 FT ULTRA LONG WIRELESS RANGE 1 plug-in receiver included will not interfere with other equipment in your home or those of your neighbors ensures you will never miss a visitor, even if you are a few rooms away or on another floor. 52 CHIMES TO CHOOSE FROM 1.1 in 29 mm stereo speaker delivers rich and crisp sound 5 adjustable volume levels with a maximum setting of 115 dB press Next or Previous button to easily choose from 52 melodies. HIGH PERFORMANCE TRANSMITTER Ultra-low power consumption uses a CR2032 lithium battery that boasts 3-year maximum lifespan IP55 dustproof and waterproof rating works between -4 F to 140 F withstands various harsh weather conditions. MEMORY FUNCTION Remembers your last melody and volume level after a power outage no need to reset to your previous settings convenient and easy-to-use design for an enhanced user experience.

Door Window Open AlarmBITIWEND door chime can be used as an alarm, or as a way to remind businesses on the front door when a customers coming in. Alerting you when someone opens the door or a window, perfect for have children or senior family members.. Up to 58 Ringtones ChoiceDoor sensor offer 58 pop chimes and 5 level adjustable0-110 dB, different chimes set for different doors so you can know which door you have a visitor come in. LED indicators are suitable for the elderly and hearing impaired.. Up to 600 FT Working RangWireless door chime working rang up to 600ft in open area, completely cover your house or store, ensures you will never miss a visitor. Note The battery level will affect the signal receiving range.. ExpandableEach door sensor or receiver can be expandable,you can use them with additional BITIWEND door sensors or doorbells. You can install them in your dining room, bedroom, living room, garage, yard, or your store and office.. Practical Gift Instead of usual, and more conventional choices, you can stand out from the crowd and offer to the people you love a super practical door chime that they will love this gift..

A GREAT GIFT for homeowners, people who live alone, the hearing impaired, anywhere you need a safe guard. Easy Installation - The door chime and door sensor are already paired. The first step is to stick the sensor on the doorwindow the distance between the two parts should not exceed 0.4 inches, and the second step is to plug the chime receiver into the socket. Installation is completed. Upgraded Battery - Using household alkaline batteries, designed with ultra-low power design, our door sensor chime allows the battery to last up to 7200 times. 600ft Wireless Range and Expandable Pairing - All the Satisure brand's door entry chime and sensor alarm can be paired with each other, and one receiversensor can pair up to 58 sensorsreceivers. With a wireless range of 600ft, it meets the needs of long-distance and multiple pairings for home, businesses, and stores. 58 Optional Ringtones and 5 Volume Levels - 58 rich and varied ringtones, there is always one that meets your expectations 5 volume levels from 0-110DB, you can choose silence or loud sound, to meet your needs in daily life The LED indicator is suitable for the elderly and those with hearing impairments. After-Sales Service - Our customers can get 30 days of no reason to re turn service and lifetime enthusiastic after-sales service support from the date of purchase. Our brand has been producing and selling security products since 1993, with absolute experience and skills. Please choose us.

1080p HD video doorbell with enhanced features that let you see, hear, and speak to anyone from your phone, tablet, or PC.. An upgrade from the original Ring Video Doorbell 2, enjoy improved motion detection, privacy zones and audio privacy, and dual-band 2.4 or 5.0 GHz wifi connectivity.. Receive mobile notifications when anyone presses your doorbell or triggers your built-in motion sensors.. Powered by the rechargeable battery pack or connects to doorbell wires for constant power.. Easily setup by connecting your Ring Video Doorbell 3 to wifi through the Ring app and mounting with the included tools.. With a Ring Protect Plan subscription sold separately, record all your videos, review what you missed for up to 60 days, and share videos and photos.. Connect your Ring doorbell with Alexa to hear announcements on your compatible Echo device when your doorbell is pressed and see a live view of your camera if you have an Echo device with a screen. Talk to visitors by saying Alexa, talk to the front door..

Wide Working RangeThis wireless door open chime for home is up to 400 ft in open area, magnetic door sensor will automatically trigger the receiver when the magnetic strip is separated and the receiver will alerts immediately whenever the door or window is opened. 247 Lifeguard for Your Family This child home door sensor alerts when burglar opens door and helps deter break-insentry alert chime activates when magnetic sensor separates. Mini Contact Sensor Magnetic door sensor Size3.0x1.0x0.60ininch,magnetic strip Size1.70.60.4 inch.They are small size and can be installed or placed at any indoor position to provide you with a door entry chimealert system.. 52 Music with Mute to Loud dB5 levels of adjustable volume from 0-110 dB.Offer 52 elegant music from the traditionalDing Dong to various well know chimes.Memory function Keep the previous setted tune after re-plugging it. Easy to installJust plug the doorbell receiver into any standard outlet and tear the double- sided adhesive tape which on the back of door sensor or screw mounted and stick them to the door or window is fine,please take the insulating paper away before using the sensor..

HIGH PERFORMANCE TRANSMITTER Ultra-low power consumption uses a CR2032 lithium battery that boasts 3 year maximum lifespan IP55 dustproof and waterproof working temperature ranges from -4 F-140 F withstands various harsh weather conditions. 400 M 1312 FT WIRELESS RANGE 2 plug-in receivers included will not interfere with other equipment in your home or those of your neighbors ensures that you will never miss any visitors, even if you are several rooms away. 52 BEAUTIFUL CHIMES 40 mm stereo speaker delivers rich and crisp sound press the Next or Previous button to easily choose from 52 melodies 5 adjustable volume levels, with a maximum volume of 115 dB enjoy pleasant melodies whenever someone rings at your door. MEMORY FUNCTION Preserves your last set melody and volume level after a power outage no need to reset to your previous settings convenient and easy to use design for a better user experience. EASY TO SET UP Can add more AVANTEK RB-1 receivers for increased coverage includes 2 screws, 2 anchors, 1 key and 1 adhesive patch for easy installation of transmitter.

Master Each Area You Care600ft150m far enough to cover every door and window in your house, door chime signal can easily cross through doors or walls,even if you are a few rooms away or on another floor. Note The battery level will affect the signal receiving range. It is recommended to change it once every 8 months.e a few rooms away or on another floor. Note The battery level will affect the signal receiving range. It is recommended to change it once every 8 months.. 58 Melodies 5 VolumeWireless door chime features 58 chimes and 5 levels adjustable volume0 dB to 110 dB to meet your needs for different occasions. Remembers your last melody and volume level after a power outage no need to reset to your previous settings.. ExpandableEach wireless doorbell receiver can pair up to 20 magnetic door alarm sensors and each sensor can add unlimited receivers. You can use them with additional BITIWEND door sensors or doorbells. Install them in your dining room, bedroom, living room, garage, yard, or your store and office.. Easy To Install Plug the door chime for business when entering into socket, tear off the tape behind door sensor chime then paste on the door. The wireless door chime has been matched before shipment. LED indicators are suitable for the elderly and hearing impaired.. Practical Gift Instead of usual, and more conventional choices, you can stand out from the crowd and offer to the people you love a super practical door chime that they will love this gift.o the people you love a super practical door chime that they will love this gift..

bINCREDIBLY STRONG, POWERFUL LOUD DOORBELLb Heavy duty, waterproof wireless door chime transmitter signal penetrates objects that other long range wireless doorbell systems simply can't - even travels through several reinforced concrete walls as well as separate buildings. Adjustable volume control from mute up to 95db. Effective even in the largest homes commercial buildings.. bDUAL FUNCTION TRANSMITTERb Can be used as a typical Doorbell Chime push button or as a magnetic door chime where door chimes when door opens making it perfect for a retail door chime, store door entry chime, gate alert, warehouse doorbell or even window alarm.. bINTEGRATION WITH 12VDC DEVICES REGARDLESS OF MANUFACTURERb Only this wireless door chime gives you the ability to add 12VDC devices strobes, buzzers, sirens, bells, etc with 4 12VDC outputs - 1 per each of the 4 zones. Transmitter features 1 NO, NC relay plug in receiver has 1 C relay.. bEXPANDABLE, CONFIGURABLE SIMPLE INSTALLATIONb Easily pair an unlimited number of transmitters to a receiver - each receiver has 4 zones, allowing for one of 12 melodies per zone. Easy, hassle-free pairing transmitter to receiver.. bA WIRELESS DOORBELL FOR HOME OR BUSINESS WITH COUNTLESS USESb Door announcer, call button for elderly, magnetic door entry alert security contact sensor for gates windows, classroom doorbell, wireless panic button to alert one or multiple rooms or locations far away..