Stepless dimming and 3 modes: The book lights used for reading in bed have a total of 9 lamp beads. Three different light colors: warm yellow light (1600K), natural light (2800K), and bright white light (5500K) Unique adjustment knob: The brightness and color temperature adjustment knob allows you to easily adjust the brightness. When adjusted to the brightest and darkest, a unique prompt will flash 3 times to prevent repeated adjustments USB Rechargeable: Unique charging mode, suitable for most USB interfaces. Plug and Play. Can be used normally while charging Unique smile face design: The unique design integrates adjustment buttons into a smiling face. I hope I can bring you a good mood and use it with you Convenience and Portability: The weight of the adjustable clip and bulb is about 45 grams, and the lightweight weight allows you to easily clip on Kindles, magazines, books and not-too-thick books Specification: Size: 180*26*22mm Battery life: 3-15 hours (depending on the brightness) Charging time: 40 minutes Built-in battery: 250 mAh Maximum brightness: 50LM Voltage input: 5V Number of LEDs: 9 Package included: 1 x Light Other items not included