Mighty Bright 40451 XtraFlex Book Light, Blue The Mighty Bright XtraFlex is a great all-purpose booklight, providing 10 lumens of brightness with a battery life of 72 hours. Powered by (3) AAA batteries or by AC adapter (sold separately), with no need to remove the batteries when using the adapter  its designed to be versatile! Manufacturer SKU# 40451. With its optical grade lens, the light is distributed evenly with no hotspots or harsh edges. It also has a strong-grip clip, and flexible, adjustable neck. The XtraFlex is a great little light youll want to keep at hand for all sorts of uses. Lightweight, portable, and multi-purpose  not just for books! It can be used free-standing on its wide base and the secure padded clamp opens to 1.5, making the XtraFlex perfect for camping, kids reading, studying, on music stands, as an automotive repair light, a computer light, for tasks, crafts &amp; hobbies, travel, and for reading in bed without disturbing your partner. Featuring 1 bright white High CRI LED (High Color Rendering Index LED) the XtraFlex provides accurate color rendering and even light output. Colors appear more vibrant and true, and with minimal optical distortion. We quality test to FCC, CE, RoHS and Reach, UL, and California Prop 65 standards, and we audit our suppliers working and living conditions, and factory safety, to ensure high standards. We are The Original Mighty Bright, designed and headquartered in the U.S.A. since 1984, providing quality booklights, lighted magnifiers, music stand lights and more. Contact our U.S. based Customer Service Team (Monday through Friday from 8am  5pm PST) at 1-800-922-3233, or email us anytime via an Amazon message. Visit our official website to see verified reviews and additional product information. All Mighty Bright product is backed by our 100% Mighty Bright Guarantee 1-year full warranty.