This Compact Book Light Offers 5 Adjustable Brightness Levels & 3 Eye-caring Color Modes, Allowing You to Customize Your Lighting for Optimal Comfort & Reduced Eye Strain. Equipped with a Built-in 500mah Rechargeable Battery, It Provides 8 to 80 Hours of Reading Time, Depending on the Brightness Setting, & Charges Conveniently Via Usb. Its Flexible, Adjustable Neck Allows for Easy Positioning on Any Book Size or Angle, While the Lightweight, Portable Design Ensures Effortless Clipping & Portability, Making It Perfect for On-the-go Reading or Bedtime Use.