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Product Description Passive Smart Glass Technologies Passive smart glass technologies respond to non-electrical stimuli and thus cannot be controlled manually. These include thermochromic, which reacts to heat, and photochromic, which responds to light. A simplistic view of thermochromic windows is that the windows are tinted during the summer and are clear during the winter, with the assumption that thermochromic windows switch based on outdoor air temperature. Photochromic simply means something that changes color in response to light. In relation to sunglasses, photochromic lenses darken or lighten depending on their exposure to ultraviolet (UV) radiation. Photochromic technology is mostly used in eyeglasses (which tint depending on the amount of light). Grey Color Self Adhesive Car Sheet Film         Car Winow Smart Glass Smart transparent film technical diagram Technical Principle In t…