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The whole setup consists of the display and the USB cable. It draws the power from a single USB port on recent notebooks, and has dual USB plugs for older notebooks that do not supply enough power for the screen.
The 0.85-inch thin display has simple controls and a stand on the back for desired viewing angle. There is no power switch, simply plugging the microUSB cable turns it on.
The laptop controls all aspect of the display, There is a physical brightness control shown here.