Two warm white (3000K), energy-efficient LEDs with accurate color rendering (80+). 35 lumens, dimmable. Durable LEDs last 100,000 hours. Precisely engineered optical grade lens spreads light evenly across pages. Flexible silicone neck. Powered by 3 AAA batteries (included) or use micro USB cable (not included). Battery life 16 hours. Gig bag included.