aluminum roller shutter window CE,TUV,RoHS Auto Roller Shutter Components keep color period 15 years Main color : White, ... manual only for manual roller shutterManual crank, Length: 0.5m——2mSurface treaded: powder-coating Rolling shutter Function Anti-sunlight, anti ... noise-proof , warm-keeping .Save energy design, when the roller shutter closed, can saving 30% energy, obstructed 100% sunshine. Auto ...