... Highlights:1) The slat total thickness is 9mm,When the shutter is compeletely closed,it can pickproof, sound insulation,heat preservation, ... sunshine penetrate is 10%, it can daylighting,adumbral,using as curtains; 3) When the shutter completely opened,it will open your eyereach, ... could use the standby electrical source or manual systemto open the shutters for escaping;Install type:Outhouse install and ...