... RoHS,SGS certificate 4)manual,wireless available Principle SHIDAI electric roller blinds system use 220V tubular motor (A built-in ... oxidation, anti-aging, corrosion preventive. According to the height of roller shutter, reelpipe diameter can be choosed 50mm, 70mm, 80mm ... use group control device with control, also can use computer platform, multimedia central control system. blackout roller blinds