DIGOO DG-SD20 Self-powered Waterproof Wireless Home No battery Volume Adjustable Doorbell EU/UK/US Plug

DIGOO DG-SD20 Self-powered No Battery Doorbell The Transmitter Self-poweredIndustry Unique Sliding Button32 Melodies and 4 Levels Volume Adjustable Feature: - Self-powered / No batteries Converting the energy from finger pressing into electricity, then transmit wireless signal. No more worrying the button runs out of batteries and environment friendly. - 10 Years Long Lifetime The outdoor transmitter has padded the pressing test more than 200000 times, which ensure your long time use. - Multiple Chimes 32 different tunes with 4 adjustable volumes choosable, you can choose your favorite chime and suitable volumes according to application environment. - Expandable & Auto Memory 20 433MHz buttons can be added never interfered by other remote devices. And the last melody and volume will be remembered after power cut. - Easy Installation Adhesive tape and screws included, you can install the it with tape or screws in a breeze. Specification : Brand DIGOO Model DG-SD20 Power Supply AC110-240V 50/60Hz Plug EU/UK/US Plug Wireless Protocol 433MHz Scalable Quantity 20 Music Configuration 32 Volume Configuration 0-100dB Sensitivity