Arbitrary Diatortion Power Saving LED USB Light for Notebook/desktop -Green for $7.09 + Free Shipping USB power no battery required, just simply turn on your laptop/PC to power your USB light 17 inch ultra flexible arm Durable featherweight construction with compact design for easy to carry Working life: 50000 hours http://www.amazon.com/Gizga-Arbitra...ie=UTF8&qid=1392208079&sr=8-33&keywords=gizga