Hello Welcome to our store Quality is our first consideration with best service. Specification: Material: ABS Color: White Lamp Head Diameter: Approx. 9cm Height: Approx. 40cm Cool Color Temp: 5500-6000K Warm Color Temp: 2800-3300K Natural Color Temp: 4000-5000K LED Quantity: 20 Power: 3W Light Modes: High-Middle-Low-OFF Built-in Battery Capacity: 1200mAh Working Time: 3 - 24hours(depends on brightness) Features: This lamp in ring shape adopting premium LEDs gives out soft and even light, no flickering. 20 powerful LEDs with 3 Brightness levels for your options. Featuring a sensitive touch control function for easily brightness adjustment. Built in rechargeable battery 1200mAh, each full charge can last up to 24hours.Flexible tube, can be bended into any angle and any height that comforts you most while reading. With a non-slip clamp, can be firmly clipped on edges of a book, desk, bed or baby stroller. Package Included: 1 x Clip-on Lamp 1 x USB Cable Note: Please allow minor deviation due to manual measurement. Due to the difference between different monitors in each computer, the picture may not reflect the actual color of the item.