Description:   TUYA ZigBee gateway is required.   1.Customize/ Button Actions. Smart knob, match the smart scene, open the smart scene with one key. You don't need to click the scene mode on the phone, just click the smart knob to open the smart scene. For example, movie mode: turn on the TV, turn off the lights in the living room, close the curtains, turn on the TV ambient light, and turn on the sound. Click the smart knob to do it.   2. Trigger routines to occur. Five different opening modes of the smart knob. Single Press, Double Press, Long Press, Rotate Press and Rotate. Five scenarios can be set, one to meet multiple needs is indispensable for you    3. Can control any smart device (Powered by TUYA) Control lights, electronics and small appliances from anywhere.      Ultra-low Energy, powered by battery. The battery can be used for a long time, so there is no need to replace the battery frequently. No need to wire in.   Without installation. It can also be placed on the table, pasted on the wall, anywhere within reach    Specifications:   Colour: Black   Material: ABS   Product name:Smart Knob   Battery: CR2032 3V DC (Not Include)   Communication:Zigbee 3.0   Working Range:50m Open Area   Working Temperature:-10°C-45°C   Working Humidity:Less than 90%RH   Life Cycle:1 Years(General use)   Dimension:40 x 40 x 26.5mm      Package Contents:   1 x Smart Knob   Notes:   TUYA ZigBee gateway is required.      Only the above package content, other products are not included.   Note: Light shooting 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.