Ah, I see, sorry. It is the 22955 knowles, they did the swap under warranty within a 20 day turnaround which I think is excellent customer service!! I have only had them back for a day or so and have been really busy so no chance to listen to them that much, there is a fit issue with my right ear so they may have to once again go back but this isn't really a problem I hope. Apart from the driver change everything else is the same.