Eforcase Professional Rechargeable Music Stand Lamp LED Light Clip-on 9 LEDS with Adapter Nine light emitting diodes( LEDs) illuminate up to four pages of sheet music. Easy access power switch on bottom controls two brightness levels Strong and flexible gooseneck arm that moves in as many as directions as needed 24 hours of battery life for continuous using on the low setting or 16 hours on the high setting (Low and High) Rugged, solid state lighting technology lasts up to 100,000hours