WiFi Version: If you do not have a zigbee gateway,and not plan to own one,please choose WiFi version.WiFi Version connect to App directly via WiFi.it can not work without Internet. Zigbee 3.0 Version: If you have a Zigbee gateway or plan to own one,you can choose Zigbee 3.0 Version.Zigbee 3.0 Version must work with zigbee hub(gateway).The advantage of the ZigBee valve is: when the network is offline(such as network arrears/weather leads to the disconnection of external network cables), which will not affect the automation operation of the ZigBee device.NoteWe provide a purchase option for the zigbee gateway with good price. If you need the zigbee gateway, please buy the gateway.If you don't need a zigbee gateway, please do not buy the zigbee gateway,because it only contains the gateway. Specifications: APP:Tuya smart/smart life/digma smart Power supply voltage: 12V / 2A Communication technology: ZIGBEE3.0/WiFi optional Communication frequency: 2.4G Valve pressure: 1.6Mpa Suitable pipe specifications: suitable for pipe outer diameter 24 to 44mmyou can adjust it. 1/2 inches,(DN15) 3/4 inches ,(DN20) 1 inches,(DN25) 1.2 inches,(DN32) The maximum adjustable diameter is 44mm. Automatic valve opening time: 5 ~ 10 seconds Torque: 30 ~ 60kg.cm Application: IOS / android application (downloadable: Smart Life / tuya Smart APP) Valve Type: Handle Valve Switch App Control you can shut or open the valve automatically with smart phone no matter where you.Ever if you are away from home,the mobile phone can be remotely controlled,open the watering valve to water the farmland,water the garden,and close the gas valve.Compatible with water pipe ball valves,timing Auto/manual/App remote control switches, suitable for controlling water valves, natural gas valves, filling pools, farm watering plants Voice Control The smart valve compatible with Amazon Alexa/yandex alice/Google Assistant, if you can not connect to Alice via tuya app,please change to smart life or digma smart App. allows you shut-off/on your water valve via your voice Manually Control: