Great for illuminating your sheet music or books on pianos and music stands in orchestra pits and dark clubs - anywhere you need some extra light. Easy to use with clip-on design and switch at rear of each light. Each arm can be switched between on between 1 LED and 2 LEDs and off independently. Light can be focused in any direction with the flexible gooseneck arms which coil up for compact storage. Powered by 3pcs AAA batteries or USB cable (both included). A great value for money light!