Wireless Remote Doorbell Waterproof Welcome Door Bell No Battery Eu Plug Memory Function 4 Modes Night Light Smart Home<br> 1. 4 Modes: Sound only, flash only, sound & flash, sound & light on.Light on mode can turn into a night light<br> <br> 2. Memory function: After the power is turned off, remember the music set before. No need to set music again<br> <br> 3. Self-powered doorbell that requires no battery,Don't worry if the battery has power, so Don't miss important visitors<br> <br> 4.Gorgeous lights, loud ringtones. Especially suitable for the elderly, pregnant women.<br> <br> 5.Self powered button.This button uses kinetic energy. No battery required<br> Specifications:<br> 1. Receiving distance: 150 M (in open area)<br> 2. Volume: 4 files 0-100DB, ringtones: 58 pcs<br> 3. Rated voltage: AC 110~ 240V ,50-60Hz<br> 4. Working frequency: 433MHz.<br> 5. Receiver standby power:< 0.5W<br> 6. Receiver size: 86X78mm<br> 7. Button size: 80x41mm<br> Package Included:<br> you can choose:<br> 1*receiver, 1*transmitter<br> 2*receiver, 1*transmitter<br> 1*receiver, 2*transmitter<br> 2*receiver, 2*transmitter