@sunnyone I don't have Phonak, but a Starkey.. rechargeable ..I certainly like the recharge case as it is the only place I put my hearing aids when not wearing them... its my left ear that is profoundly deaf.. so when riding in a car with someone having the hearing aid in my left ear that simply rebroadcasts to my good ear those sounds that come from my left that otherwise I would have a tough time hearing.. I find the remote mic particularly helpful when talking on the phone .. the Bluetooth rechargeable has several settings .. one where you can give to your friend who is wandering around the house... I keep the mic on a lanyard around the neck.. Starkey uses "Thrive" as the smart phone App that controls many things... if you have an Apple or Samsung or such phone it is very helpful.. Since I received my phones from the Veterans Administration they provide walk-in help with issues and can replace some things very quickly.. Ken