USB POWERED & USB ADAPTER - Comes with a USB cable and a USB adapter. Power supplied by USB cable, convenient to access to any USB port like computer, USB plug or even power bank. With the USB adapter, it can directly connect into a wall outlet to work. THIN & PORTABLE DESIGN - It is ultra-thin(0.24 Inch) and light weight(1.4Lb), thus you can take it anywhere. 3 LEVEL ADJUSTABLE - Dimmable, 3-level adjustable brightness, change the illumination easily. TOUGH SENSOR SWITCH DESIGN - Turn on/off and brightness control just by slight touch. Super bright LED lamps provides a perfectly even illuminated surface.