[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. It shows that even after the water has dried, the doorbell transmitter can still be used normally. villas and gardens. Even if you are in the garden or on the second floor you can hear the bell. And will not interfere with other electrical signals in your home.^ [No batteries required ]: The concept of our 2 receiver wireless doorbell is environmental protection and comfortable life. This doorbell has no battery. So you don't have to worry about changing the battery. At the same time, it also contributes to protecting the environment.^ [Compatible Design]: We researched most household sockets in Europe and designed the most compatible wireless bell size, which looks simple but beautiful. Suitable for most households in Europe. And the doorbell installation is very convenient.^ [Different Ringtones and Volume]: 37 kinds of ringtones and music to choose from. Most customers choose "Ding Dong".