BDF S15 Window Film One Way Mirror Silver 15 (Dark) - 36in X 12ft EXCELLENT DAYTIME PRIVACY. Provides great intended privacy during daytime only; the mirror-effect is reversed at night since the interior will be exposed to more light than the exterior. The side with the most light will have the mirror-like appearance. DARK AND REFLECTIVE to create a mirror-like appearance while reducing cooling costs during the summer through effective heat rejection. STRONG ADHESIVES to last many years. For easier installation, remember to use A LOT of soap/water mixture to soak both the adhesive side and window. HIGH QUALITY PERFORMANCE films that are sensitive by nature. Please remember to take caution when handling the film as the slightest fold will create a permanent wrinkle. FREE TOOLS AND EASY INSTALLATION GUIDE to make installation DIY-friendly. Make sure window surface is completely clean and absolutely free of any blemishes. BE AWARE, as the name suggests, the intended privacy mirror-effect works during DAYTIME only! The side exposed to the most light will produce a more reflective appearance. Therefore, the mirror-effect will become reversed at night since the interior will usually be exposed to more light than the exterior. Window film is to be applied on the inside of your window unless specified otherwise. Perfect for living arrangements where you want to maintain privacy during the day without completely blocking off the sunlight but have curtains or blinds to use at night for continued privacy.