1.Size: 21in screen magnifying glass size: total length 19.6in (50cm), total height 14.3in (36.5cm). The screen is 19.3in (49cm) long and 10.5in (26.7cm) high. 2.The use of high-definition zoom optical technology can increase the display effect of mobile phone notebook screens by 3-4 times. Protect your eyes, prevent visual fatigue, and provide you with ultra-clear picture quality and 3D high-definition video dynamic effects. 3.The product support is made of environmentally friendly wooden materials, and the screen magnifying glass is made of high-definition optical lens materials. Multiple viewing angles can be adjusted to meet your different needs and enjoy the visual feast. 4.The screen magnifier is foldable and portable, suitable for all kinds of computers and mobile phones. It can be used in various occasions, including living room, bedroom, kitchen and outdoor activities.