For use when you're driving your HUMVEE or any military vehicle and need to tow a civilian trailer with a 7-way Connector. You can also buy our adapater allowing you to connect to a civilian trailer with a 4-way or 5-way connector. The power coming to your trailer will still be 24V. Simply change out your light bulbs to 24V bulbs available on ebay. (24V LED Bulbs will also work with your 12V civilian vehicle)