Features: Mobile phone APP eWelink remote control, you can shut or open the valve automatically far away from home. Make life more convenient and save time. Compatible with water pipe ball valves, electric, manual control switches, and natural/liquid/tap gas, suitable for controlling water valves, natural gas valves, filling pools, farm watering plants. The Zigbee smart valve compatible with Amazon Alexa and Google Home Assistant, allows you shut-off/on your water valve via your voice. Set timers to automatically open or close the valve. Applicable to new and old gas water pipeline valves, no additional piping, users can install it themselves. In order to prevent power outages caused by the inability to use,there is a manual clutch at the bottom of the unit with a pull ring, which allows to move the lever to close or open the valve. Installation Guide: 1. Valve controller installation must be on the same axis between valve controller axis and valve center axis, otherwise the valve can not be completely closed and opened. 2. After the valve controller is installed, the clutch pull ring can be pulled down manually, and the controller handle can be switched manually to check whether the valve switch is in place.