Product Material: PlasticSize: 11.5*5.8*2.1CMVoltage: 3.7VLumens: 16 lumensBattery: 3.7V 200mAhPower: 0.2WCharging time: 1.5 hoursWorking hours: up to 8 hoursMode: Two gears adjustableColor temperature: 1st gear, 4000K; 2nd gear, 1550KWhite colorQuantity: 1 PiecePackage Contents: 1*Book Lamp, 1*Instruction Manual (including battery)1.USB rechargeable Built-in USB for easy charging, directly connect to laptop, power bank, car charger or USB socket for charging without extra cables. Charge time is about 1.5 hours and work time is up to 8 hours (at brightness setting). 2. Small and lightweight mini size design, 11.5*5.8*2.1cm, small and light, suitable for clipping on books when reading at night, foldable, completely flat and thin, convenient for plane, train or back reading travel car seat. 3. Flexible lighting angle Fully flexible design, the LED lens can be rotated horizontally 90 left and right and 45 down; 350 flexible bracket can be bent at any angle for the best viewing effect without constantly repositioning the light. 4. Adjustable lighting mode Soft white light, brightness to choose from, soft warm light creates a private reading space for your bedtime reading, allowing you to choose the perfect brightness while reading; enjoy you without disturbing your roommates Reading time in bed. 5. Gifts for kids: Small and functional, this book light is a great gift for kids who are avid readers who love to read everywhere. Can also be used as a bookmark or mini flashlight during a power outage.