PRYMEBLU BTH-300 Industrial, Military Spec Certified, Durable, Enterprise Bluetooth Headset for Kenwood - Black
Does not work with Harris radios that have native Bluetooth and support PTT.  As far as I know, there is no compatibility list available from manufacturer.  The only way to know if it will work is to buy it...and then return it when it doesn't.  Received audio quality seemed about average for Bluetooth.  PTT button would not key radio.  Returned.  I will update when manufacture responds as to whether or not they have any plan to upgrade firmware to support other PTT implementations.