Power Acoustik HD-7 power input?

I am installing a Power Acoustik HD-7 7" LCD monitor in my car. I got if off ebay and it has no instructions. My only question is how many vlots do I hook up to it? I assume 12volts but I thought I saw some screen that only take 7.5 volts. I dont want to fry the screen. there are only 3 wires comming off the screen. Red, Black and Yellow. The yellow on has two wires in it and I assume it is the video input. I need to know if 12 volts will be okay to hook up to the red and black wires.

I called and found out what the voltage is. Thanks for all your guys' help.