roller shutter motor: 1:low power consumption, low noise 2:security and stability 3: high performance, long lif roller shutter motor:1) Strong horsepowder , overheating protection device. 2) Easy manual operation when power off, can also be equipped with electrical storage devices. 3)Loading up to 300kg/500kg/600kg/800kg/1000kg/1300kg 4)Limit switch unit enables precise adjustment of door in both ...