This is the patented book cover that illuminates your reading materials anywhere without requiring a separate book light. A light built into the cover's spine turns on automatically when it is pulled out and turns off when it is retracted. Its dual LEDs cast bright light across both pages and its head can be precisely adjusted so as not to disturb airplane seatmates or a dozing spouse. The cover is durable yet pliable .8 mm black leatherette that won't split or crack and protects against dirt and spills. Includes an attached cloth bookmark. Requires three AA batteries that provide 40 hours of illumination. Hardcover. 10 1/8" H x 7 1/2" W x 1 1/2" D. (8 oz.)