... AC power is cut off,this rolling door motor (DC&AC available ) will turn to DC24 battery supply ... suitable products to you. 1) manufacture AC, DC, AC and DC Rolling Door Opener, design and make motors according ... meet obstacle, alarm function, lighting and so on…8) our Rolling Door Opener pass CE and we start ... ,LOCK BOX, INFRARED SENSOR, ALARM SYSTEM.AC&DC MOTOR LOAD CAPACITY420-450 SETS FOR ONE 20GP ...