New Special Edition Black PCB with all the same features and functionality as our very successful self-contained four-channel 12VDC relay box You may use a fifth switch and wire harness connected to the Master input to control the entire on/off functionality of the relay box. Alternatively, you may hook an accessory wire from your vehicle’s ignition to the IGN input for easy remote turn-on capability. You also get ignition interrupt and master/slave functionality.