For hi-freq. loss, for years I used a Whisper 2000 adapted to cheap stereo earbuds (Mee). Then I got a $30 behind-the-ear open-fit model from China which was fine except the battery door, which is the on-off switch, does not get properly retained, and needs to be taped, which is awkward. Then I got a V-99 from China for ~$12 (but more now/here), which is very good in that it uses an AAA battery. (The Whisper uses 2 AA cells.) Unfortunately, the V-99 cannot be adapted to earbuds (by me, anyway), but the earpiece is very good for the high sounds, and the thing can be whipped out and stuck in during the moment when you say "could you please repeat that". Hey, you folks who love to spend thou$ands on your hearing devices should take a look at AliExpress, and at Amazon (where the prices (for some of the same things) are several times higher), compared to the places where you buy your rebranded devices for really big money. P.S. the Whisper 2000 can still be found on eBay. It is worth its weight in gold. It has an internal parabolic? microphone, allowing it to be effectively pointed at the sound source. I think they were like $9.95 years back.