The Best Waterproof wireless doorbell

Self-powered ( No battery needed ) wireless doorbell, which turns kinetic energy into an electrical signal to ring your wireless doorbells. More convenient and greener than the battery operated doorbell Plug in wireless doorbell, easy to install and set up. No wire wiring required Built-in 36 selectable ringtones, each of them can separately match one receiver, helping you to tell that at which door someone is knocking. The 4 levels volume is adjustable and loud enough to cover your house Power off memory, able to restore your tunes setting when a power cut accidentally happens Long Range Wireless doorbell, the signal can pass through doors, walls, floors. By adding the number of receivers, you can get longer range. Compact size, the receiver is smaller than ever before, saving space of your socket Wireless doorbell with multiple receivers: You can choose the number of receivers according to your house area and building structure