Two energy efficient LEDs per gooseneck cast bright white light. Durable LEDs last 100 000 hours - no replacement necessary. 24 Lumens. Two switches control up to four lighting levels. Precisely engineered optical grade lens spreads light evenly. Sturdy padded clip firmly grips music stands. Base can be used freestanding. Two flexible goosenecks. Light easily folds for convenient storage. Powered by 3 AAA batteries (included) or optional AC adapter (sold separately). Optional cradle base (not included). 13.5"L x 1.5"H x 1.75"W. Whether you are in the recording studio at a performing arts centre or in a multi-purpose room the best performance demands the best equipment. With four possible light levels the Duet2 offers twice the intensity of the Duet and brightens two to three pages of music. Tap-on power buttons make it easier for musicians to prep quickly for performances.