The WonderFlex Rechargeable all-purpose book light provides 20 lumens of warm white light via two energy-efficient LEDs. It provides clear, consistent light that is easy on the eyes.; Rechargeable (charges fully in 3 hours); 3 brightness levels with step-down dimming; Battery life: 10 hours on high, 45 hours on low; Precisely engineered optical grade lens spreads light evenly; Two energy efficient LEDs cast bright warm light; Constructed of flexible and durable silicone and ABS plastic; 8" Flexible neck; Charges in 3 hours with included micro USB cable; 20 LUMENS