The blackout window film is designed to block all lights and create a good sleeping environment for sleeping during the day. With top privacy level, this window film could effectively reject views from outside and give you a total personal room without interruption. It can also block 100% of harmful UV rays, keep you and your beloved ones from direct sunlight. This non-adhesive film uses static cling technology to easily attach to your window, you only need to totally clean the window surface and spray a lot of soap water onto the glass surface before applying. It can also be easily removed with no sticky residue and can be reused. The grid lines on the protective liner make it easy to cut precisely to the desired size. Completely filling the needs of all-day light-shading and absolutely letting no light through, providing you with the 24-hours excellent privacy protection. Perfect for nightshift workers, college students, and tired parents, anyone who needs a dark room to ensure the best sleep quality during the day. Also ideal for baby's room and nursery to darken for daytime naps. When the natural light is needed, just open the windows! *INSTALLATION TIPS: Before installation, please totally clean the window surface and corners to ensure that there is no dust on it. Remember to remove the protective liner before applying and spray plenty of water onto the glass surface and static cling side of the window film for adhesion(the more water, the better). After installation, please trim the edges and leave enough gap between the edge of the film and the window to easily squeeze out the air bubbles.*