This pair glasses with 4 function is a pair of composed glasses including anti blue light computer glasses, photochromic sunglasses, polarized sunglasses and night vision driving eyeglasses.Please kindly note that the one with 2 function only have the photochromic grey function and anti-blue ray function. UV400 POLARIZED PROTECTIVE LENSES-SHINU sunglasses are superior to other sunglasses - when moving indoors or outdoors, the lenses adjust to the reduced lighting conditions automatically.and the anti blue light polarised lenses reduce flare and glare.it's perfect for cycling, running, fishing, driving, mountaineering, skiing or hiking, this sports sunglasses is also your fashion accessories. SHINU night vision glasses can be used in a variety of complex environments. At night, it eliminates a high beam and brightens the ground. in foggy weather, it illuminates the field of view and keeps the vision clear; when it rains, it lightens the load and ensures safe driving.