Percentage FunctionA new revolution of technology, equipped with the latest chip, you can adjust the percentage of the curtain up and down between 0%-100% via APP or voice control, so as to control more precisely the light area. App Control & Timer:Use App "Smartlife", open/close the shutters anytime anywhere. You can also customize opening and closing by timer. Automatically opens in the morning to meet the first rays of the sun and regularly closes at night to protect your privacy. Voice control:It can connect to Alexa, Echo dot and Google Home to control the opening, closing, stopping and electric roller shutter percentage, such as "Alexa, open / close the shutter." "Google, stop the shutter", "Echo, set the roller shutter to 50%".(Need Neutral Line) Touch induction and the right sizeUsed the high quality tempered glass panel ,L The touch screen is more sensitive than before, and the backlight design provides comfortable viewing. The size is slimmer and fits the built-in size of most homes, making installation easier. High Security and Group ControlSwitch overload and fire protection ensure your safety .For multiple shutters, group control can be set via APP to facilitate your operation. we offer two years after-sales warranty for you. NotePrecise calibration currently is not compatible with Bubendorff brand. You can search ASIN: B09NZM9QW4 to check the etersky flap module, its quick calibration can be suitable for this engine.