This Energizer LED Book Clip Light can be used on books, clipboards and multipage manuals. With just one bulb, this LED Book Light gives off six lumens of lights. It features a multi-position flexible neck and an extended large spring clip. To operate this LED Clip Light, it requires two CR2032 lithium coin cell batteries. Weighing in at just 1.34 ounces, this Energizer LED Book Clip Light can be taken nearly anywhere.