Waterproof: The waterproof doorbell is made of high-quality material, which can effectively prevent water from entering and keep your home clean. No battery: No battery needed, just plug it into the doorbell and you're ready to go Fit many occasions: Suitable for indoor and outdoor use, such as home, office, bedroom, bathroom, kitchen, living room, etc. Good signal, strong penetration, stabilized radio frequency technology, the measured distance in the open field reaches 150 meters, and the wall penetration distance is 15-30 meters. Different batches, different angles and lighting, there are slight differences between the actual product and the picture, which will not affect normal use Colour:White Material:ABS Package Contents: 1x transmitter 1x receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.