Hello, I wanted to know if changing the receiver on a Pure 7 from Standard to Power would increase the volume or does it require a different Pure 7 model? I noted that there were three models but didn’t know if it was only the receiver portion that is different. Also, on a completely different note, does anyone make a hearing aid anymore that does NOT have a transmitter in it or can be shut off. I’m trying to avoid having RF frequencies drilling into my head any time I wear a hearing aid. If cell phones are bad for your head, so too, would be a hearing aid broadcasting into the skull. Thank you.