No battery required: When the wireless doorbell presses the corresponding button, the transmitter automatically generates the energy and sends a stable signal to the receiver. Solve the problem of changing batteries and save at least 10 per year on battery costs. HD LCD display for temperature, humidity and time: the wireless doorbell is equipped with temperature and humidity sensor, which can detect the change of temperature and humidity indoors and outdoors in real time, so you can enjoy a . The time reminder function ensures that you do not miss an important moment and increase the happiness of life. Waterproof and wireless: wireless door intercom for outdoor use with IP45 waterproof, working temperature between -4 F to 149 F (-20 C to 65 C), can be used outdoors and can withstand different weather conditions and the wireless range is up to 150 m outdoors. Does not interfere with other devices in , satisfy your installation anywhere in your house. 38 melodies and 4 volumes: The wireless outdoor doorbell switches from a song at once by pressing the button to select the song on the receiver up to 38 CD sound cycles are complete, and has 4 adjustable volumes from 0dB to 100dB (with mute function). With the memory function, the pairing will not be repeated. Easy to install: Plug the receiver into the socket, tear the insulation film on the waterproof bell to attach it to the wall or install it firmly with the screws. Plug Type: EU Plug, it applies to Indonesia, Germany, France, Spain, Italy and so on. Material:plastic colour:Photo Color Package Contents: 1 * transmitting device 1 * receiving device Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.