Energy saving and environmental protection, reducing the high electricity bill brought by air conditioning heating. Block UV invasion, protect indoor objects from fading and aging. Filter bright light, reduce glare, protect skin and eyesight. Increase the strength of the glass, reduce personal injury and protect property, and build an invisible protective net. One-way perspective, protect privacy, let the living space enjoy the comfort, tranquility and comfort. Improve building appearance and beautify indoor living environment. Easy to install, easy to clean, rub-resistant, no special maintenance required. Economical and practical, no fading, no bubbles, long use time.