YiZan window film will bring your home and office a comfortable living environment with its unique style and multiple practical features. Rainbow window film crafted by 3D laser process,features faceted appearances in varied light conditions, creating prism effects in sunlight,casting gorgeous rainbows into the room,and resembling etched glass in the night. (This window film itself does have no color but it will create rainbows when the sun hits it!) This upgraded semiprivate one way window film serves a functional purpose in adding partial privacy for your personal space by preventing people outside from seeing directly into the room and obscuring outdoor views,obsure the view without sacfificing natural sunlight. Moreover these one way window film serves a functional purpose in keeping cool for your personal space with up to 5070Percent heat insulation ratio, which can providing a more comfortable room for you and your family, and cut energy bills by at least 20Percent. In particular, it has strong toughness and high reducibility, allowing the electrostatic glass film to be used repeatedly for many times, and there is no need to worry about creases in the process of use. Package Includes : 1 Roll x Film 1 Piece x Instruction Manual (sealed together with film roll) Installation notes: This product is only suitable for clean and smooth glass surface, do not use on rough, uneven, frosted glass or other materials,While using, be sure to tear off the back film, otherwise it will not be firmly attached. Please note the distinction between front side and back side, be sure to attache the back side (smooth side) to the glass, otherwise it will not be pasted firmly and even fall off.