This Smart Button is powered by CR2032 battery. After connecting with Zigbee gateway and adding into Smart life App , it allows you to quickly "set the scene" for a particular room or living scene, like Reading, Movie, and so on. Smart Button is a time and energy-saving item alternative to the traditional hard-wired switch, with push button design it can be stick on the wall or put it on everywhere you like. Features: A Zigbee gateway is required for using this Zigbee smart knob scene switch. Customize button actions. Trigger routines to occur, like single press / double press. Compatible with APP, control lights, electronics, and small appliances anywhere, create scene linkage, DIY home automation. CR2032 cell powered, ultra-low consumption, strong endurance. Mini and lightweight, no tool required, easy self-adhesive installation. Specifications: Power Supply: Battery CR2032 3V DC (the battery is not included in the package) Communication: Zigbee Control Distance: 25m open area Operating Temperature: 0-55 Working Humidity: < 90%RH Life of Battery: 1 years (General use) Material: ABS Item Size: 50 * 50 mm / 1.97 * 1.97 inch Package Size: 7.5 * 7.3 * 1.7 cm / 2.95 * 2.87 * 0.67 inch Package Weight: 25g / 0.88oz Package List: 1 * Smart Knob Scene Switch 1 * User Manual (English)