GE LED Book Light, Clip-On Battery Operated, Black 17207 Super bright light output Long lasting LED bulb (10,000 hours), up to 20 hour battery life Clip-on LED book light for targeted light where you need it Requires two CR2025 batteries Fully adjustable positioning for base and light source Clip-on LED book light for targeted light where you need it Super-bright light output Long-lasting Nichia LED bulb (10,000 hours) Up to 20-hour battery life Requires two CR2032 batteries