Feature: 1. COMPACT AND PORTABLE: USB rechargeable book reading light is designed to be compact, lightweight and easy to carry, convenient to use at any time and any place. 2. FLEXIBLE DESIGN: Clip on book light has a 180 degree free rotation angle and multiple rotation and bending methods, so users can freely adjust it according to their needs. 3. EYE PROTECTION: Book reading light has a soft, even and non blinding lighting effect, so that users will not be annoyed and eyestrain for a long time reading. 4. THREE LIGHT COLORS: USB rechargeable book light has three light colors, warm and cold light freely adjustable, you can choose the right light color according to different situations. 5. LONG BATTERY LIFE: USB clip on book light has a built in 180mAh lithium battery and supports USB charging, with a long battery life, suitable for indoor and outdoor use. Specification: Item Type: Clip On Book Light Material: Plastic Product Size: Approx. 11x5x1cm / 4.3x2.0x0.4in Gross Weight: 51g/1.8oz Battery Type: 1 x Lithium Battery (Shipped with Built in Battery) Battery Model: 402030 Battery Capacity: 180mAh. Package List: 1 x Clip On Book Light 1 x Instruction Manual Note: All data are measured manually, and there are certain errors in the measurement results.