HD Vision Visor's secret is a clear polycarbonate specially tinted to diffuse strong sunlight and glare; and reduce headlight glare at night. It’s simple, easy, and requires no special tools or batteries. It works on any car, truck, or caravan as long as you have a visor already installed. Reduces blinding glare from the sun during the day Brightens vision and cuts harsh headlight glare at night Enhances colour, clarity and contrast 100% polycarbonate plastic Quick and easy to install – clips onto any visor in seconds