Its a pioneer usb/bluetooth player with handsfree....i dont get radio..or its weak most of the times...so i just buy this adapter and i am sorted ??Yeah. Old style aerial fitting. I left mine out when I swapped my old polo stereo out. Probably left out because your stereo doesn't fit it. Does your radio work or just the CD player? This would tell you if it's bypassed already or if you need to adapt it to fit yours.
It's called an iso. And if you have a newer aftermarket stereo it's more than likely a din fitting. They are all slightly different to look at but all work the same. Hope this helps.
Keywords: iso to din adaptor.