... Various power:600N,800N,1000N,1200N,for garage door use 3)appropriate for different door sizes. Yantai Shengda Doors Technology ... industrial door, sliding door, rolling door, Door Accessories, Door opener(Motor),Door operator,etc..Grage door opener feature:1.economical mode ... at stand-by situation2.run:5minutes short load3.motor:DC step-b-step motor with transformer and over load protection4.position ...