Nine LEDs illuminate up to four pages of sheet music. Easy access power switch controls two brightness levels. Sturdy, proprietary spring clip provides solid and simple attachment to music stands. Integrated fin keeps light from distracting audience. Solid state LEDs never require replacement. Flexible gooseneck allows for precise adjustment. Powered by an AC adapter or three AA batteries (both included). Features an extra long power cord (13 feet / 4 meters).