IP68 Waterproof: The waterproof outdoor wireless doorbell can withstand the harshest outdoor weather conditions such as heavy rain, snow and scorching sun. We have tested it and put the doorbell transmitter into the water. It shows that the doorbell transmitter can continue to be used normally after the water dries. 150m Wireless Range: The range of the wireless 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 the bell. And does not interfere with other electrical signals in your home. Battery-free: The design concept of our front doorbell with 2 receivers is environmentally friendly and comfortable. This front doorbell has no battery. So you don't have to worry about replacing the battery. At the same time, it also contributes to environmental protection. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.