... ) Thermal efficiency protection device, protect rolling door from damage and motor burned.3) When power failure, it convenient to manual operation. 4 ... stand-by battery (14AH/12V) , and it works when the power off. 6) Remote control: long-distance operation. Notice: Your prompt ... .Best regards, ----ZhangZhou JinAn Electric & Machine Co.,Ltd. Roller doors closer with remote control