I used a plug and play harness from Safewireless.com and it worked perfectly, they had the best price on the net and it also came with a free microphone wind screen cover. Safewireless.com also has a FAQ's on their site that they referred me to for the Parrot car kits and it was much more helpful than the owner's manual.There is much more to this kit than what you think, check out the FAQ's at Safewireless.com.The CK3000 is a great kit with superb audio quality, but the address book in your phone does not auto-sync like the Parrot CK3100, therefore you will need to use object push to send each contact into the CK3000 one at a time, if you have allot of contacts, you can use switch the car kit into the mode where you use the voice dialing from your phone, however, when you use the voice dialing from your phone instead, you will not be able to get the your voice announcement of the person calling, this assumes you synced your contacts and programmed the voice tags and tagged your contacts, very easy process. Also, the voice recognition is likely better with the CK3000 although the newer phones voice dialing is getting better.Many people like the idea of having a display, if that is the case, get a CK3100 (if you do not care about A2DP (audio/music/bluetooth) ).