Waterproof and Automatic Wireless Doorbell for Outdoor Use Without Batteries. Wireless outdoor doorbell, waterproof and automatic without batteries, temperature, humidity and time display, wireless doorbell with 38 melodies and 4 volume levels. 【Ready to Use】: This waterproof wireless doorbell for home is paired before delivery. No wiring or electrician installation is required during use, and installation can be done in 1 minute: plug the receiver into the socket and it is ready to use. 【Long Range】 : This wireless remote control doorbell with high-frequency electronic technology uses FM signal patterns, which has strong anti-interference ability and one-to-one signal matching. You don't have to worry about poor connection with the signal next door. And the detection distance can reach 600 feet in a free environment. 【HD Display for Temperature, Humidity and Time】The wireless doorbell is equipped with temperature and humidity sensor, which can sense the indoor environment's temperature and humidity changes in real time, so you can enjoy a healthy life. The time reminder function ensures you never miss an important moment. 【Weatherproof and Energy-Resistant】: The wireless battery doorbell is made of high-quality ABS material, which has excellent flame-retardant and flame-retardant properties. Operating temperature: -4°F -140°F. IP45 dustproof and waterproof protection. The transmitter uses advanced self-powered performance and does not need to install batteries. 【Exclusive Appearance and High Quality】: The doorbell has updated 38 songs and 4 levels of adjustable volume. With 4 adjustable volume levels (with silent function) from 0dB to 100dB. We have advanced automation equipment, high precision placement. We strictly control product quality. If anything is wrong, please contact us as soon as possible to find a solution.