5200mAh Large Capacity Li-ion Battery Having a built-in 5200mAh battery in an LED light pad offers the advantage of portability and extended usage without needing a power outlet. The upgraded A2 wireless light box comes with a USB cable and US adapter for charging. Once fully charged (4 hours), it can operate at maximum brightness for approximately 3 hours. It offers both battery and USB working modes. Brings great convenience to your creative process. 6 Levels Dimming/Stepless Dimming & 3 Color Temperatures Short press of the A2 light pad switch button to on/off the lightpad and allows switching between lighting color temperatures: Cool white, warm white, warm light (3000K -6500K)