It is using tubular Motor with huge power and hot-protection device, which could up, down and stop at random. It is noiseless and easy to adjust.The material of the tube is aluminum with high quality and strength without distorting. The surface has done with anode oxidize,which is prplanet the surface from aging and resist on corrosion. One can choose the aluminum tube with diameter of 50mm, 65mm and 90mm according to the height and weight of blinds. It use tape roll support with the same inner diameter. In order to make sure the safe and reliance, the bracket is alloy steel, which is good at resisting on curving and cutting.