window blind
1. Regulate the light, ventilated: It can prevent the indoor light from shining outdoors at night; Sunlight will shine the room to make bright and warm in winter, meanwhile, it can guarantee the room to be ventilated, and sheltering strong sunshine in summer, make the room become nice and cool.
2. Save the energy: It can prevent warm air flows outdoor, promote the efficiency of of the air conditioner; In summer, it will shelter the strong sunlight, keep the cold wind from the air conditioner
3. Protect the individual privacy: Through regulating the angles of the blade face, can stop the line sight from upper or nether. If want to stop the nether sight, should adjust the convex of the blade face to indoor, if want to stop the sight from upper, do it on the contrary way.