Just a USB cable connected to the computer, computer supply power directly through USB, no need additional power connection

Mini USB 2.0 input
4-wire resistive Touchscreen
Resolution: 800 x 480 (H x V) formatted
Automatic display adjustment
High-Brightness LED Backlight
4 adjustable backlight levels for daytime or night-time use
Accessories: One USB Cable, One driver CD disk, One manual

Screen Size: Digital 7 inch
Dot Pixels: 800(H) x (RGB) x 480(V) = 1,152,000 (dots)
Aspect Ratio: 16:9
Contrast: 250:1
LCD Brightness: 350 cd/m2
Input Power: USB (DC 5V)
Operating Voltage: USB 5V 0.5A
Power Consumption: 2W-4.5W
Dimension (cm): 20W x 14H x 33D
Weight (kg): 1.55

Headrest:

Standard Accessories
USB Cable                    1 PC

Driver CD disk                 1 PC

Manual                       1 PC