supersonic gate and door automation co., limited lies in the changzhou city Jiangsu province. It is about 2 hours drive away from Shanghai port, very convenient for transportation. Our company was founded in 2000, it is a specialized manufacturer of Roller Shutter Door Motor, Swing Gate Opener, Garage Door Opener, Remote Control system in China. We have been cooperating with the worldwide distributers for many years, and are reagarded as the excellent supplier by them. All of them greatly appreciate supersonic&＃039;s products because of their superior quilty and resonable price. With a highly qualified technical team we are capable of developing new products according to the requiments of the customers, and are willing to accept orders against customers&＃039; samples, specifications and trade marks. "improving one step everyday&＃039;&＃039; is our peresistent principle. We sincerely hope to co-operate with companies home and abroad on the basis of equality and mutual benefit. And looking forward to hearing from you soon.