Baytion Book Reading Light with Bookmarks, USB Rechargeable Book Light for Reading at Night in Bed,3 Color Modes & Stepless Dimming, 360° Adjustable, Portable Clip-on Book Lamp for Kids Travel-Black

Built-in battery only takes about 2.5 hours to get a full charge and support up to 30-40 hours lighting at lowest brightness. USB rechargeable reading lamp compatible with any USB ports on your computer, USB adapter and power bank，Ideal for bedtime reading, travel, or emergencies—no more frequent charging hassles