This is a 6 inch adapter cable to hook up the 7.4V battery to our 12V products like the jacket liner, pants, gloves, glove liners and socks. Red 4017 coax plug to red 5525 coax jack. Make sure you are using the correct Amperage battery to cover the draw. For example use the 5.4A battery with the gloves, glove liner and socks. For the jacket liner or pants, use the 7.8A Battery.   You might see adapters like these on the powerlet site. Like so many of our cables and adapters, they did copy our designs. If you ever get ahold of an old gerbing catalog, you will see all the cables we were making for them and Harley years before powerlet was in business.