This product is safe and reliable, stable in performance, easy to install, and can be equipped with anti-breaking chain safety device. It has two kinds of AC 220V and 380V voltage driving motors, and has an internal heat protection device, the motor can be manual and electric. The upper and lower travel are automatically controlled by the limit switch, which is convenient to adjust, accurate in positioning and low in noise during operation. Matched with remote control, it can realize wireless remote control of door curtain opening and closing; When power failure occurs, it can be operated manually or equipped with reserve power supply to complete the door curtain opening and closing.