3 LIGHTING MODES 10 BRIGHTNESS LEVELS Our LED desk lamp has 3 color temperatures optional: Warm light (3000K), Warm white light (4500K) and White light (6000K). Each lighting mode has 10 brightness dimming levels,30 light modes in total. Press button can allows you to adjust the brightness level between 20% and 100% more accurately. ADJUSTABLE METAL CLAMP LONG SWING ARM The strong metal clamp supports a desktop up to a 2 inch table and holds the swing arm lamp securely in place.You can freely adjust the angle, position, light directionaccording to your personal need. EYE PROTECTION Our LED desk lamp has uniform brightness, no glare, no ghosts, soft light, it is comfortable and healthy for your eyes. brightness can be adjusted according to your own needs. Use high-quality LED lamp beads,better protect your eyes, let you focus on work. USB POWERED MEMORY FUCTION The package is not including the adapter. 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 Note Only Match with the adapter of 5V/2A (DC)- otherwise it will cause damage the button controller to short-circuit, and the lamp will only turn on for few minutes and then go out.