Our LED desk light can be easily to plug the USB cable into any available USB port (laptop/ desktop/ power bank/ USB adapter) to power the lamp. The lamp will remember your brightness setting when turn off the light, not cut off the power supply.
Please use 5V/2A adapter for the desk lamps. Otherwise, the desk light will not reach the highest brightness or flicker due to insufficient voltage and current, or cause the desk lamp to be damaged.