The Relay Harness with Switch is designed specifically for high definition 10 inch light bars. It features battery terminals on one end and an illuminated switch and Deutsch connector on the other end, making it easy to connect to your light bar. This harness is sold individually and is designed to connect a single LED light bar to your 12 volt electrical system. It is compatible with most 10 inch high definition light bars, making it a practical and convenient solution for your lighting needs.