Specifications:-
a) Self-powered doorbell
b) Battery-less Transmitter
c) 58 tones to choose from
d) 4 grades of adjustable volume
e) IP44 waterproof
f) Receiver working voltage: AC 110v - 220v
g) Energy saver & environmental friendly
h) 3 ring modes: Chime only/ Indicator lights only / Chime & Indicator lights
i) Sound decibel: 25 - 85dB
j) Frequency: 433MHz