Neutral wire required: WLAN shutter switch for installation, the neutral conductor is required. Alexa roller shutter is 8 x 8 x 3.5 cm. 2022 updated version, solved the noise problem. Either plan and time setting: you can set the LED blind switch to automatically turn on and off. WLAN roller shutter switch turns on Saturday at 10:00 a.m. and off at 6:00 p.m. Support sunrise and sunset setting. Voice control system: -"Alexa, open the blinds." The WLAN touch roller shutter switch can be used with Alexa, Google Assistant to manage your device with voice control. 2022 Upgraded Version- Percentage Control and Auto Calibration: The auto calibration function can upgrade a conventional motor (UP/DOWN/STOP) to an intelligent motor with accurate percentage control (1%-100%). You can use the meross app to adjust the roller position for more comfortable light. This feature has been added in the updated 2022 version. Safety and service: Attention: neutral wire required. The smart roller shutter switch is made of PC flame retardant material and has passed safety and quality assurance. Overload protection circuit. We offer lifetime online support. Press the top arrow to open the curtain. Press the bottom arrow to close the curtain. Press O to stop the curtain., Weight: 0.29982867632 Pounds, Manufacturer: meross