Attention..!! These are the worst pieces of.... electronic devices that I ever have. These are Linx Quattro (top of the line $5k +) and they are really really a problem. I have them for a little more than a year, and so far they already were replaced under warranty and now guess what?... I had to send them to factory Again.... (by the way, I'm senior, stay home and very careful with them). Dr. office provide me with a temporary "demo" pair, well, at first Android update start the problems and I can't connect them to the phone, the "Smart" app just can't find both, sometimes finds the left one or the right one, but never both. This is very frustrating. I do recommend DO NOT BUY these hearing aids, go to any other brand, any.... GN Resound engineering and R&D sucks..!! Just.. DO YOUR JOB