Review on Effortless Car Control: PolarLander Universal Wireless Steering Wheel Controller for Music, DVD, GPS Navigation, and Radio - 4 Key Remote Control Buttons in Sleek Black by Rodney Nelson

Great product but NOT compatible with (most) Pioneer head units IF you don't connect it to a PacAudio system. And yes, I tried to make a cable, with 1 and 2 pin options. I spoke directly to Pioneer. It doesn't even start (my) radio to bring up the button mappings setup screen. I LOVED the fact that the 2 remote drives were tiny. About the size of a half dollar coin (millennials, ask your grandfather what that is). Makes placement very versatile.