This is a female '20-pin' plug for replacing the original factory Honda and Acura radio with an aftermarket. It was used from approximately 1998-2008. This would be plugged over your existing factory radio plug. It will have approximately 6" of wiring pigtails.

This uses the aftermarket standard wire colors, for your convenience. Your aftermarket radio should use the same colors, making it easy to determine which ones to mate up to form your own custom adapter. This eliminates the need to cut or modify your factory harness and the need for wiring research.