I ordered it on Friday and got it on Monday. Wow, this thing is great. it plugs in to the headphone jack, and has a 3.5mm female plug at the end, with a microphone and answer button in the middle. It works perfect. I can listen to MP3s in one car with the cassette adapter plugged in, and on another car with RCA adapter plugged in. It also allows me to answer and place calls through my stereo.

Check it out.

http://www.pocketpctechs.com/detail...._ID=PPCPADPT09

I am not affiliated, just a happy customer.