1.21 Inch Large Size: A universal screen magnifier for notebooks/tablets/mobile phones. 19.6 x 14.3inches(50x36.5cm), screen is 21 in. 2.The Screen Magnifying glass uses high-definition optical lens material, the wooden frame bracket is environmentally friendly, and can adjust multiple viewing angles. It can enjoy 3D vision away from the screen, effectively preventing mobile phone radiation from harming the human body. 3.Screen Magnifier Use high definition optical technology to enlarge 3 times on the phone screen, eye protection and anti-blue light radiation, no power consumption, Relieves discomfort and visual fatigue caused by focusing on small screens for long periods. 4.Easy to use, the screen is not easy to deform. A good gift for children to help them protect their eyes when watching up close. The gift for the elderly to help them see the screen more clearly. Effectively prevent the radiation generated by mobile phones from harming human eyes.