【HD LCD Display for Temperature, Humidity and Time】 The wireless doorbell is equipped with temperature and humidity sensor, which can know the indoor and outdoor environment temperature and humidity change in real time, the time reminder function allows you not to miss any important moment . 【No Battery Needed】 When the wireless doorbell pushes its button, the transmitter automatically generates power and sends a stable signal to the receiver. It solves the problem of replacing batteries. 【Waterproof Durable and Long Wireless】 Outdoor wireless intercom with IP45 waterproof, working temperature between -4 °F to 149 °F （-20 ℃ -65 ℃), can be used outdoors and withstand various weather conditions and the wireless range is up to 150m in open area. 【38 Melodies and 4 Volume Levels】 The wireless outdoor doorbell switches between songs by pressing the song select button on the receiver until 38 CD-quality ring cycles are complete, and has 4 volume levels adjustable from 0dB-100dB (with mute function). With memory function, it will not repeat pairing due to power off. 【Easy to Install】 Insert the receiver into the socket, tear the insulation film off the waterproof doorbell to attach it to the wall, or install it firmly with screws (included); includes 1 * receiver, 1 * transmitter, 2 * double-sided adhesive tape, 1 * instructions.