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The system is spring tension motor system:perload roll tube coiling fabric,fabric configuration the other end of the draw rod.Two left-rotation or right-rotation volumes Rope installed on reel motor,volume traction wire rope wound around the device,while the wire through the zipper fixed on the fabric of the traction poles.Traction motor driven rotating wire volume to overcome the spring roll tube in the spring under the effectof torque would be pulled back to spring roll fabric volume and taut fabric tube.So that together they complete the relese of the fabric and take-up actions,and then play a shade dimmer function.