Even though I'm a Vet, I bought my hearing aids thru Advanced Affordable Hearing website. I got the HCR3 ones that are rechargable. They were around $248 each, but they sure work. They have an on/off switch, volume control and program button to set the right hearing sound.
Had bought another pair, from another website, but the volume control had to be adjusted off of the ear with a small screwdriver. There was also a sound that came thru that I simply couldn't get rid of. This set cost us $85, but we sent them back and got our $85 back. The old saying "cheaper doesn't always mean better" really applied to these.