for sale is a PC99-X06
It is used to get the steering wheel controls working when you fit a non oem stereo.
Your stereo needs to compatible and you need to buy an extra lead to connect to your particular type ie JVC, PIONEER etc. These cost a couple of quid. It will come with the JVC lead.
This item would cost a minimum £19.99 plus postage. From me only £10 all in.
I tried to use it with my car and a JVC unit but mine is half canbus (early model) and it would not play ball.
This is the unit for sale on lowcostcaraudio
Please check it is suitable for your needs. Only problem is because I have never got it to work I do not know if it works. So no warranty!
The first one I had went back because I thought it was faulty but it turns out that it was my car not the lead due to the half canbus because the replacement did not work either.