mixbox 20419 Wireless Sensor Security System

High sensitivity, long range, stable signal. Works up to 80m in an open area. 36 chimes to choose from and 8 level adjustable volume to meet your needs for different occasions. The doorbell has a power-off memory function, will restore the last volume and chime setting when power backs on. Low power consumption, easy to install, simply plug in, no wiring needed. Color: White Size： Doorbell receiver: 8 x 8 x 5.3cm Doorbell transmitter: 4.5 x 4.5 x 1.7cm Material: Plastic, metal Voltage: AC110-240V Wireless frequency: 433MHz Coding mode: 1527/330KΩ Applicable temperature：-20℃-±55℃ Applicable humidity：40%-80%RH Working distance: up to 80m (open area) Weight: 0.2kg Note： 1. This product includes a wireless doorbell set,e, no other decorations. 2. Due to different lighting and screen settings, the color of the item may differ slightly from the picture. 3. Due to manual measurement, please allow slight difference in dimension. What's in the box? 1 x Wireless Doorbell