Note: It needs to work with SONOFF ZBBridge, eWelink gateway Hub which supports ZigBee protocol. It can't work without eWelink ZigBee intelligent gateway. Overview: This is a mini and compact DIY smart switch used for different kinds of switch boxes, even the smallest EU standard switch box. Convenient to automate your home appliances with eWeLink app through your smartphone or tablet or your voice command. Features: *Remote control your home appliances with the app. *Set a time for devices to make it start or stop running automatically. *One-tap pairing with SONOFF ZBBridge. *Support external switch connection. *Compatible with SONOFF ZBBridge, Amazon Hub, Samsung SmartThings Hub, and Philips Hue Hub. *Fire-proof and flame-retardant shell ensures maximum safety for your device. *ZigBee3.0 protocol with AES-128 encryption keeps the security of device data. *Can be a signal transfer station to extend the signal transmission *Compatible with Alexa and Google Home for voice control. *Create smart scenes to trigger groups of SONOFF devices on/off via tapping on your phone. Note: 1.The antenna has strong electricity inside, do not break the wire jacket. 2.To make sure the stable RF signal, please keep the wire away from the metal component in the switch box when wiring. Specifications: Brand Name: SONOFF Input: AC 100-240V 50/60Hz 10A Max Output: AC 100-240V 50/60Hz 10A Max Protocol: ZigBee 3.0 Material: PC V0 Size: 42.6*42.6*20mm Package List: Smart Switch (1/2/3/4/5/6/8/10/15/20PCS Optional)