... roller shutter window and door Electric roller shutter window and door Material is Using 97% purity aluminum ingot 6063T5; Surface treated power coating; Components ... in vision will be off. Pure manual only for roller shutter window Manual crank, Length: 0.6m, 0.8m, ... , noise-proof , warm-keeping .Save energy, when the roller shutter closed, can saving 30% energy, obstructed 100% sunshine. electric ...