The Original Mighty Bright WonderFlex Clip On Book Light Reading Light, Warm Eye Care LEDs, Super Flexible, Durable, Dimmable, Perfect for Kids, Bookworms, Read in Bed, Batteries or Micro USB (Black) The Mighty Bright WonderFlex is the perfect all-purpose booklight, providing 20 lumens of adjustable brightness with a battery life of 30 hours. Powered by (3) AAA batteries or by any standard micro USB cable, with no need to remove the batteries when using USB power  its designed to be versatile! Manufacturer SKU# 47510. With its three levels of step-down dimming you can easily select your desired brightness, and with its optical grade lens, the light is distributed evenly with no hotspots or harsh edges. With a strong-grip clip, soft-touch silicone overmold, and flexible, adjustable neck, The WonderFlex is a go-to project light youll want to keep at hand. 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 WonderFlex perfect for camping, kids reading, studying, on music stands, as an automotive repair light, a computer light, for tasks, crafts & hobbies, travel, and for reading in bed without disturbing your partner. Featuring 2 warm-tone High CRI LEDs (High Color Rendering Index LEDs) that mimic natural lighting, The WonderFlex 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.