USB 2.0 Clip-on Flexible Book Reading 28 LED Light Lamp Battery fr PC Notebook Computer Black Generic LED book reading light. Easy to use with Clip-on or freestanding. Bright LED light with ON/OFF switch. Powered by 3 AAA Batteries (Not included) or a USB Power Cable (Included). Size: 38cm x 0.5cm - 14.96inch x 0.19inch.