1.Description: sonoff zigbee bridge smart hub gateway wifi home bridge wireless compatible with alexa/google assistant 2.Features: a bridge between zigbee and wifi devices, can match sonoff zigbee multiple sensors for more smart scenes. You can control devices that wifi/zigbee supported together on ewelink app via the bridge. Long distance signal transmission. Support voice control to connect alexa or google home to simplify your daily life. Removable and easy to install. Group and manage sub-devices on the home page of app, no need to access the sub-devices page. 3.Specifications: model: zbbridge input: 5v 1a wireless connections: wi-fi ieee 802.11 B/g/n 2.4Ghz, zigbee 3.0 Working environment: -10℃~40℃ material: pc v0 weight/size: 35g/62*62*20mm 4.Note: there is a little of difference according to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. 5.Package list: 1*sonoff zigbee bridge