I have been to five different hearing professional looking at the Phonak Adeao iv (9). Not shopping price as much as I’m looking for someone that seems to know what they are doing. I have seen everything from botched demos to a very few that do know there product. I have worn hearing aids for 32 of my 62 years. One of the big differences I’m finding is some of the places say the Adeao has a 2 year factory warranty and some insist it is 3 years. Does anyone know which is correct and where I might find it in writing.