Wireless Doorbell Kit,ANG Waterproof Door Chime,No Battery Required for both Transmitter and Receiver,3-Level Volume,38 Ring Tones Wireless Kinetic Doorbell No battery or wire . By pressing the push button, it converts kinetic energy into an electrical signal to ring your wireless doorbells Waterproof and flame resistant design. The internal components of the transmitter are waterproof coating, it still works well in rainy days; receiver is made of ABS plastic, inflaming retarding and environmental protection 38 Different Ringtones :There are 38 different ring tones with 3 levels of adjustable volume, and flashing light indicator Easy installation:two ways for your choice,you can screw it (all parts included) or use the tape (included) to secure the doorbell switch to a wall or door Long operating range.At least 110m working range, You can place the plug-in receiver several rooms away from the door