How to Use: Touch switch, single touch to adjust brightness, long press to adjust color. Specification: Item Type: Book Reading Light Material: ABS Built-in Battery: 2 x 18650 Lithium Batteries 4000mAh (Battery Included) Light Source: White, Warm, Natural Light Mode Function: Rechargeable, Three Level Brightness, Three Colors Light Source Charging Method: USB Appearance Color: White Number of Beads: 31 Power: 5W Luminous Flux: 370LM Product Size: Approx. 29 x 35 x 15 x 2cm / 11.42 x 13.78 x 5.91 x 0.79in ( Manual Measurement, Slight Error May Exist ) Weight: Approx. 448g / 15.80oz Package List: 1 x Book Reading Light (Battery Included)1 x USB Cable 1 x User Manual