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Durable clip on light. Two warm white (3000K), energy efficient LEDs. Accurate color rendering (80+). Continuously dimmable up to 20 lumens. 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 cord (not included). Battery life 30 hours.