One doorbell host can add up to 20 buttons/detectors
One button can be add into unlimited doorbell host
You can buy compatible wireless botton in this link: 
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KR-M523 Wireless Doorbell
Sensitive & Waterproof Button
The doorbell transmitter is so sensitive and can withstand rain, snow
Battery NOT INCLUDED
Corlorful LED light
32 songs optional
The wireless doorbell for home has classic chimes including “rooster crowing”, traditional “Ding Dong” and so on.
5 levels of adjustable volume from mute to 120dB,
include a choice of no sound just LED flashing.
Never again miss a visitor because you didn't hear them knocking
Easy to install
Just plug the receiver into power socket and attach the transmitter on door,
you don`t even necessarily have to make holes or damage anything.
Wide Working Range
Powerful 330 feet wireless range and will not interfere with each other when installed at close range, or those doorbell signal from neighbors.
Compatible with alam sensors & detectors
Expand your doorbell system with 20 door sensor or transmitters, perfect doorbell for classroom,
business, office. Customize your doorbell according to your need.
Wide Working Range
Powerful 330 feet wireless range and will not interfere with each other when installed at close range, or those doorbell signal from neighbors.
Technincal Parameters
1. Working Voltage: AC 100-240V
2. Working Current: < 100 mA
3. Wireless Frequency: 433 MHz
4. Wireless Distance: 100 meters (about 330feet) in Open area
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