i sell them and fit them as well and unless you have a nokia phone with a nokia kit you get savage echo . the amount of nokia cradles etc that are faulty out of the box is mad ,ck15w is nice but from experience parrot stuff is more reliable . just keep software up to date and they will work with any bluetooth phone . parrot trouble usually comes from fellas pairing up too many phones and syncing contacts of each untill they clog the memory and get the memory full problem ,easily fixed by resetting the control box.