Well i waited forever for my 10c Pro. THe unit lasted all of 2 weeks before the sound cut out. If you wiggle the harness or slightly pull it out then it starts to work. I know it isnt a faulty harness because i have just installed a spare kit in my other helmet. Same thing. I purchased from Revzilla. Revzilla wants nothing to do with it because the box has been opened. Sena has been a pain in the ass to get this thing repaired under warranty. Now im without a device and leaving for a week long trip. Should have kept my 20S as a backup spare. Kinda sad that would have needed to be done. 

Right about now Cardio is look good