Here's some light reading: The Energizer Book Light emits a warm, white LED light with superior contrast for optimal reading conditions or other up-close tasks. The exclusive beam design delivers broad illumination while still being narrow enough to not bother anyone near you. Forget lugging around a flashlight, this book light is easy to travel with-its flexible neck and compact size fit in your pocket, backpack, or purse without hassle. Simply clip the reading light onto a book, binder, tablet, eReader, car visor, or any other surface that is 0.5 inches (13mm) thick. Re-creates natural reading conditions with advanced LED technology. 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 can't put down. A perfect small gift for students, auto mechanics, pilots, teachers, and more. Runs on 2 Energizer CR2032 Batteries (included).