【Built-in lithium battery/back magnetic】built-in 1800mAh lithium battery, Type-C USB interface charging, back magnetic adsorption function, can be adsorbed on the surface of iron objects 【CCT mode】adjustment button to increase the color temperature valuewhile lower button to decrease. Short press the button once and the color temperature value will changes in 100K.Long press the button to adjust the value from 3200K to6500K quickly. Brightness adjustment: press the upper adjustmentbutton to increase the brightness value while lower buttonto decrease. .