Parameters:
Consumed power:<10mW
Receiver Volumne:25~85dB
Working Frequency:315/433 MHZ
Operating distance:150M in the open air
Receiver Plug:USA/EU/UK/Other plug
Material of bell housing:ABS
Receiver Working Voltage:AC110V-220V
Doorbell wife:5~7 years

Features:
1.Kinetic Battery free doorbell
2.Good design.
3.25pcs musice for chosen
4.3 Grade Volume adjusting
5.IP55 waterproof
6.Operating distance up o 150M,the disance can be repeated by receivers