Natural Lite features precisely engineered optical Grade lenses that spread light evenly. Durable metal gooseneck allows adjustment to any position. Sturdy clip grips to almost anything. | Four energy-efficient LED's, total output 32 lumens. LED life: 100, 000+ hours. | Dimmer function with High & low brightness settings. | Operates on 3 x AAA batteries (included). estimated battery life for 3 alkaline batteries: 16 hours. | AC/DC jack (AC adaptor/ USB cable not included, sold separately )