Curtain Operator Manual start: Pull curtain about 10cm by hand, curtain will open and close automaticallyManual Operation is enable in the absence of power supplyMiddle position set: Stop Location can be set at the middle for better lightingMultiple controls: Remote control,switch, or smart remote control used accordinglyAutomatically set memory running point: After powering off, the motor will set running point for opening and closing again when power onCustomized track length: DIY design, get any length needed