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 – it’s 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 you’ll 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 & hobbies, travel, and for reading in bed without disturbing your partner.