[IP68 Waterproof]: The battery-free radio doorbell withstands the harshest outdoor weather conditions such as heavy rain, snow and scorching sun. We tested it and put the doorbell in the water. It shows that the doorbell transmitter can still be used normally after the water has dried. [150M radio range]: The range of the doorbell receiver can reach a radius of 150m, which is suitable for apartments, villas and gardens. Even if you are in the garden or on the second floor, you can hear . And doesn't interfere with other electrical signals in your home. [No battery!]: The concept of our radio bell with 2 receivers is environmentally friendly and comfortable living. This doorbell has no battery. So you don't have to worry about replacing the battery. At the same time, it also helps protect the environment. [Compatible Design]: We have researched most of the household electrical outlets in Europe and designed the most compatible radio bell size that looks simple but nice. Suitable for