... quality roller blinds 2)low voice, easy to install 3)ISO,RoHS,SGS certificate 4)manual,wireless available Principle SHIDAI electric roller ... driving power etc, it’s a upgrade product from manual roller shutter. Reelpipe is high quality aluminum alloy material, high ... , anti-aging, corrosion preventive. According to the height of roller shutter, reelpipe diameter can be choosed 50mm, 70mm, 80mm ...