Equipped with LED technology, this book light eliminates the hindrance of faulty or burnt out bulbs associated with many other book lights. Four AAA batteries power the book light for durations up to 40 hours, making it an ideal companion for a long flight or car ride. The book light features a high quality acrylic lens, a similar construction to that of a pair of reading glasses. Two levels of brightness enable readers to adjust the book light to suit particular environments and optical capabilities with a simple, one-touch button. For the best results, clean the book light like other optical equipment with a lens cleaner and a soft, micro-fiber cloth. Storing the book light within a book or a protective case prevents scratches, dust and other debris from obstructing the lens surface while extending the light’s longevity. Batteries are not included with the book light. The book light measures 7-2/5 by 5-1/2 inches. --Jessica Reuling