Having a second power harness for our Black Box series cases allows you to bring the PC in the house for updating software or adding content in the house while leaving the original harness wired in the car.  You can also customize your existing case to work with our harness. It is the only harness on the market that that has connections for the standard power, ground, accessory power, and amp remote turn on, but also allows you to add either a 5 or 12v output with the remaining two lines. Our locking metal plug is much more rugged then similar plastic harnesses on the market.