TUGAU Photochromic Sunglasses will dim in any bright light in 0.1 seconds. The stronger the light, the deeper the shade. These are the first sunglasses with LCD technology and work very well. Color changes instantly when exposed to sunlight. When you blink it, you will miss out on the LCD coating getting active. When you step indoors, the LCD tint on the sunglasses instantly turns off and allows you to spend a day in crystal clear. It is also lightweight, so you barely know you are wearing it. The bridge of the nose is nice material, soft but firm and comfortable. It comes in a very nice box with a sunglass case, so it will not damage your sunglasses while you store them in the glove box or other place. If you like high-tech things, these will surely delight you and protect the sun from your eyes as long as you have them.