The power wires of the car audio system determine how your stereo works. It is ideal to connect all wires through the wiring harness, but if it not possible than you have to establish a direct power connection. There are two types of power connections: switched power and constant power. When the stereo is connected to a switched power, it turns on only when ignition is turned on. This prevents the car’s battery from draining. In a constant power source the system is always on thereby protecting all your preset stereo settings and clock settings. You don’t have to reset them every time you on the vehicle. Secure payment option is there for online ordering at autoradio-1001.com.