HD optical lens - 8 layers and polishing for 5 times. 99% light transmitting. Against blue ray and radiation, It is support IOS and Andriod, suitable for short sight myopia from 0--500 degree, djustable object distance and with a wide range to 80 degree. Fit for most phones with 4.0-6.0 inch screen. The product size: 19.0 x 11.3 x 10.4 cm. Smaller than the normal ones.