HDE Bright 28 LED 3 Mode Clip On Lamp Flexible Neck Clamp Desk Light (USB or Battery Operated) 28-bulb LED lamp can be powered by battery or USB for ultimate compatibility with tablets, laptops, PCs, paper / hard back books, or any other time you need a little extra light Clip on design makes unit easy to connect to anything with flexible neck for all angle lighting Three different brightness settings allow for total customization for any light setting Comes with removable DC to USB cable for anytime you want to switch from battery to USB power source Great for use at the home, office, school, or any setting!