Photochromic film is an smart light control product , and the light transmittance changes with the intensity of sunlight illumination . It is a natural dimming product for cars , yachts , building doors and windows, lighting roofs and other places. It using high-vacuum sputtering and high-precision nano-coating technology , more than 99% of UV blocking will protect your skin and products from UV rays . More than 80% of the infrared barriers reduce energy consumption , and a new generation of intelligently tuned visible light for a comfortable ride.