Energizer, LED Clip Book Light, Lightweight, Broadcasts 14 Lumens, Flexible Rubber Neck Bends Easily & Holds Its Position, Wide Angle Nichia LED, Oversized Spring Clip Easily Attaches To Books, Kindles, Clipboards, Car Visors, Provides 10 Hours Of Continuous Runtime, 10" Overall Length, Uses 2 Replaceable Lithium 2032 Coin Cell Batteries, Included.