Self-sufficient wireless doorbell home kit: Transmitter (button) and receiver require no batteries. When the transmitter is pressed, it generates electricity on its own and sends a stable signal to the receiver. You don't have to worry about the unexpected situation that the wireless doorbell doesn't work when the battery runs out

Waterproof wireless doorbell: The transmitter has a waterproof ring structure, and the wireless doorbell can withstand harsh weather conditions 60 tones and 5 volume levels

Long working distance: This wireless doorbell for home/apartment/classroom/factory/hospital has a wireless range of up to 150m, which ensures that you won't miss your visitors even if you are several rooms away or on another floor. Make sure your door is not made of metal, as metal can greatly interfere with the signal and significantly shorten the doorbell's normal operating distance.