Features Wireless Transmission Technology --- This switch adopts wireless transmission technology, which can realize wireless linkage with other smart devices. Users can remotely control the switch through smartphones or other devices to realize intelligent control. Low Power Consumption --- This switch adopts low power consumption technology, with long battery life, and is easy to use, eliminating the cumbersome process of wiring and making installation simple and quick. Expandable --- This switch is expandable, so users can add more devices and build a more complex smart home system to meet different needs. Excellent Alloy Material --- This switch is made of excellent alloy material, which is sturdy and wear resistant, and not easy to be warped, as well as high temperature resistant and has a long service life. Dimming Control --- This switch realizes dimming control of lights in home scenarios, which can be adjusted according to the weather as well as the level of brightness and darkness to provide a more comfortable lighting experience. Specification: Item Type: Smart Bulb Knob Switch Material: Alloy Battery: CR2032 Button Battery 240mAh ( Shipped With Built In Battery ) Operating Voltage: DC3V Maximum Current: ≤10mA Wireless: for Zigbee3.0 Wireless Transmission Distance: Open Range ≥ Approx. 30m/98.43ft Working Environment: -5℃-45℃(23℉-113℉), ≤95%( Non Condensing). Package List:1 x Knob Switch1 x Wall Suction Cup1 x Manual Package List 1 x Knob Switch 1 x Wall Suction Cup 1 x Manual