(Note: in the evening its function is reversed, it is dark outside and if the light is on, the mirror effect is inside while outside you become visible again to passers-by. As a result, curtains must be provided. ) Protect from heat and Anti UVThis mirror film for window allows a Blocks 99% of UV and 85% of Infrared, heat passes through less, avoiding having hot rooms in summer because of from the sun, keep the house cooler and will prevent furniture discoloration. Protect from direct sunlightOne-way mirror film also helps to have less sunlight, slightly for the room is less bright (So beware of its dimming effect). In summer, comfortable light allows you to work better and watch movies. Easy to removeThe one-way film is made of high quality materials and is mounted more securely to prevent splashing if the glass breaks.Easy to remove, no residual marks. Easy e to install This privacy window film The installation itself is very simple but you have to remember to remove the transparent protective film and that you have to thoroughly water the mirror film and the window then with a squeegee the bubbles are removed . (Note: 1.bubbles will go away over time. 2.recommend taking careful measurements especially for width.)