Aluminum roller adopts new material of aluminum alloy, the double layer slats is shaped by hot extrusion, which more stronger and with the function of prying resistant.The surface of the slat conduct oxidation processes and  painted in the condition of high temperature.The coating is symmetrical and not easily to flake away, good adhesion, and strong resistant to corrosion,  durable and nice.Using specilized exterior motor with  thermel protection device ,durable,low noise, easily to install. The open command is electric, with fixed button switches and remote controls.it can open manually in case of power failure also. The opening speed can up to 0.1m/s,which save the power largely.the working noise is less than 58 db.