Prevent prying eyes: This one-way mirror film protects privacy during the day: the more intense light side will produce a mirror effect. The other side, it will be transparent, this allows you to see outside without being seen. Protect from heat: Its reflective power (reduce the heat of the windows). This one-way mirror can anti 99% UV and cut 85% heat. It protects the skin against damage caused by UV rays. Penetrate daylight: Small loss of brightness but clearly perceptible temperature difference and prevents prying eyes from the outside. Easy to install: This one-way film is not sticky after spraying with clean water and easier to install than an adhesive film. After the water is dry, the viscosity is restored and is stronger than films without glue. Different effect between day and night: When the indoor light is stronger than the light outdoor at night, people outside can see people inside. Don't forget to draw the curtain at night.