USB Power Supply: Any usb socket can power an electronic reading light, whether it is a computer, a mobile phone charger or a power bank. Eye Health Care: 3 color temperature mode options provide comfortable light, improve work efficiency, and adjustable brightness to create an eye healthy workspace. Easy To Install: Clip on design for instant installation, no screws required, no damage to laptop, suitable for any monitor from 0.2in to 0.4in (0.5 to 1cm) thick. Space Saving: Mount on a laptop monitor without a base and traditional light arm, saving space on a desk especially for small desks. No Screen Glare: Asymmetric optical design, only illuminates the table, does not shine on the screen, and avoids reflected glare.