The doorbell is using a battery-less transmitter. (Kinetic technology) It has 58 tones and 4 volume settings. It is IP44 water proof, energy saving and environmental friendly. It comes with 3 ring modes: Chime only/ Blinking lights only (For people with hearing problem) / Chime & Blinking lights. The sound decibel: 25 - 85dB and frequency: 433MHz.a) Self-powered doorbell

Function

Kinetic Battery free Transmitter

Operating distance up to 150m

Self-Learning code function, no interference

Include 58 pcs music for Chosen

4 Grade volume adjusting

IP55 water proof

Transmitter Button Lifespan: 200,000 Times

Music IC with memory function, when power off, the tone and volume keep the same.

4 modes includes

Ringing + Flashing light,

Ringing only,

Flashing light only,

Ringing + Lighting all the time (like a night light)