The light provides comfort and versatility to accommodate a variety of lighting needs through 4 powerful LEDs rated for 100,000 hours on each head and two brightness settings. The latest LED technology guarantees a bright light source and minimal energy consumption. A practical and extra-wide clip provides for easy attachment to all music desks or table tops with a thickness of 25 mm. The light is powered by 3 (1.5 V AAA) batteries (included) with a typical battery life of 10 hours. The light comes with a 5 V power adapter and a 3 m cable as well.