Specifications: The hw-tech rolling door intelligent electric motor has simple and refined shape. The machine is designed with a alarming damping mechanism of motor shaft, under normal condition, output end of motor is unable to rotate and the whole system locks in, so the door can't reciprocate to guarantee the security. The alarming damping can release in electricity or be tightened by cable, so if it's out of electricity, it also can open the disaster box with lock by adjusting cable to release the damping, then the rolling door can reciprocate manually.