[IP68 Waterproof]: The battery-free wireless doorbell can withstand the harshest outdoor weather conditions such as heavy rain, heavy snow and scorching sun. We tested it and put the doorbell in the water. This shows that even after the water has dried up, the doorbell transmitter can still be used normally. [150m Wireless Range]: The receiving range of the doorbell can reach a 150m radius, suitable for homes, villas and gardens. Also if you are in the garden or on the second floor you can hear the bell. And won't interfere with other electrical signals in your home. [No Battery Required ]: The concept of our 2-receiver wireless doorbell is environmental protection and comfortable life. This doorbell does not have a battery. So you don't have to worry about changing the battery. At the same time, it also helps protect the environment . [Compatible Design]: We searched most household sockets in Europe and designed the most compatible wireless bell size, which looks simple but