One-way mirror window film, privacy protection, sun protection glass sticker, heat control, reflective film, self-adhesive window film. Feature: Privacy Protection: The self-adhesive window film creates a transparent space that blocks external view, but you can still see outside from the inside and know what's happening outside. Note: Principle of one-way perspective: It is difficult for the bright side to see the dark side. Currently, there is no one-way film on the market that cannot be seen through even when the lights are on at night. Since you can see outdoors from indoors, it means the film is transparent. Transparent films can only achieve a one-way perspective by utilizing the difference in light intensity. UV Blocking: The glass film blocks most harmful UV rays to protect your skin from damage and reduce fading and aging of furniture. Heat Control: Keeps you cool in summer and warm in winter, providing you with a comfortable environment. Safety Protection: If your glass accidentally breaks, this window film can prevent the broken glass from splashing, to protect you and your family. NO GLUE: The window film is glue-free, easy to install and remove without residue.