The Periscope Book Light is an ingenious answer to a common dilemma faced by travelers, commuters and late-night readers: how to illuminate a book in dark places without cords, clips or clutter. The Periscope Book Light in a book cover is based on a lightweight design that integrates a superb, retractable reading light with wide angle ultra-bright LED’s inside a luxurious book cover. Never again will you need to remember to pack, or search for your book light, because it always stays with the book you're reading. Plus, your book and your privacy are protected. Runs on 3 “AA” batteries (not included) and is available in black, brown, blue and red.