Hangzhou ADD Window Energy Saving Technology Co., Ltd. is located in Hangzhou China. It is an innovative technology enterprise specializing in R&D, design, production and sales of intelligent sun-shading motors and control systems. Our team has 16 years of experiences in R&D and operation of sun-shading motorization products. We focus on market pain points, know end user’s needs and have created and launched the motorized products which has promoted industry changes. Since the first day ADD Window was established, we have defined our mission is to promote the motorized sun-shading industry to be closer with the end user.