Universal Compatibility LCD Screen -- LCD screen shows current battery charge ,input and output status, no more guessing whether need to charge it or not. It also displays the time which can remind you when it's time to take a break. . 3 Color & 3 Brightness Adjustable -- Unlike other reading lights, our tiny book light has 3 reading modes and 3 brightness levels available. You can choose the best suitable brightness, which can protect your eyes and prevent eye strain effectively. This book light is bright enough to see the entire page, but not so bright that it will disturb anyone else in the room. There is no flickering or harsh light, so it's designed specifically for late-night reading. . USB Rechargeable & Long Lasting -- This rechargeable book light is built-in USB with no additional cables needed, compatible with any USB ports on your laptop, mobile adapter or power bank or USB outlet for recharging. The reading lamp also has a built-in 300mAh battery providing you with 860 reading hours ( depending on your brightness setting ). . Flexible & Portable Design -- The clamp on the lamp can be opened up to 120, so it can be attached to a wide variety of surfaces. The lamp head can be rotated left, right and down with angles of 90, 90, and 45 respectively, so you can direct the light exactly where you want it. It is only1.34 oz(38g), small and lightweight, which is portable for reading when camping, travelling on cars, trains, or airplanes.