The Relay Harness with Switch is a practical and efficient solution for connecting high definition 20-30 inch light bars to your 12-volt electrical system. This harness features battery terminals on one end and an illuminated switch and Deutsch connector on the other end, making it easy to connect a single LED light bar. Designed to fit most high definition light bars, this product offers convenience and reliability. With its user-friendly design and durable construction, the Relay Harness with Switch is a must-have for anyone looking to enhance their lighting setup.