Energizer Clip Book Light for Reading, LED Reading Light for Books and Kindles, 25 Hour Run Time (Batteries Included) Handy, compact, portable Book Light runs on 2 Energizer CR2032 Batteries (included) Re-creates natural reading conditions with advanced LED technology Compact design with flexible and collapsible neck and built-in clip make a perfect travel or camping companion or copilot Delivers a beam broad enough to see, yet narrow enough for privacy Has a runtime of up to 25 hours, perfect for those books you just cant put down Clips onto books, tablets, car visors, or any other surfaces that are 0.5 inches (13 mm) thick A perfect small gift for students, auto mechanics, pilots, teachers, and more