Its precision engineered optical grade lenses are specifically designed to distribute a wide field of consistent lighting with no hard edges. The precision lenses work in conjunction with High CRI LEDs (High Color Rendering Index LEDs) to provide better color rendering and even light output. Colors appear more vibrant and true, and with minimal optical distortion. You can also quickly adjust the light output to three different levels by clicking the button on the light head. With its durable, soft-touch silicone gooseneck and strong-grip clip, you'll find unexpected uses for this versatile light. The dimmable LEDs are rated for 100,000 hours and are powered by three AAA batteries, with a typical battery life of 30 hours (batteries included). This light is not rechargeable, but it can also be powered by any standard micro USB cable and charging block (not included). Ideal for medium and paperback-sized books, longer trips requiring extended battery life, or anywhere you need focused, warm, bright light.