Ushoppingcart Black Bright Flexible 9 Leds Clip-on Orchestra Music Stand LED Book Reading Light Lamp with Adapter Lamp Light Flexible gooseneck allows for precise light adjustment; Sturdy clip attaches to music stand or sits freestanding. Easy access power switch on bottom controls two brightness levels; Powered by an AC adapter or three AA batteries( Batteries are not included) Clip-on 9 LEDS with Adapter