Keep your home safe When used on exterior windows, one way glass film allows you to see outside clearly but prevents others from seeing inside. Would-be thieves will have no idea when you\'re home – which makes them much less likely to attempt a break in. Maximize your privacy One way window film allows you to see out crystal clear yet others can\'t see in. Let the light shine in and brighten up your home, enjoy the location of your home without feeling like you\'re on display. Save on utility bills Using window films can significantly reduce your utility bills during the warmer days of the year. This window tint can save some people up to 50% off their cooling costs, depending on the size and type of windows in their home or office. Reduce glare on computer screens or TV Glare make it virtually impossible to see what\'s on the screen, and be a huge distraction. One way mirror window films can significantly reduce or even eliminate this glare. How To Install: 1. Measure windows and trim film, cut the film 1\" larger than the size you need. 2. Clean the window glass and wet it with A LOT soapy water. 3. Affix taps on both sides to remove the plastic liner from the film. 4. Starting from the top, apply the film to the window. 5. Squeegee out any air bubbles or imperfections with a smooth tool, such as a credit card or a spatula. (No spatula or squeegee is included in this item). 6. Trim away extra film. Attention: 1. It only provides privacy during the daytime. That is because the mirror surface reflects the daylight which is much brighter than a home\'s interior. However, when the sun sets the effect reverses, making it easy to see inside. Remember to draw curtains during night. 2. Mirror effect: The mirror effect we said means it has a slightly reflective effect, not totally like a mirror.