Book LED Light - Open the Cover to Enjoy Bright 500 Lumen LED Illumination - Rechargeable Lithium Ion Battery Provides up to 4 Hours of Light on One Charge - Unique Gift Idea (Yellow) Iconic lamp that blends modern design with versatile function to bring light into your life. Open the book to gradually reveal a gentle radiance of white light. When you're done soaking up the light (or showing off to friends), close the book & watch the light disappear. Small enough to bring with you anywhere. Lightweight (1.5 lbs). Cordless functionality: Built-in rechargeable Li-ion battery with an included USB charger