My hearing aids ARE grey, and they are OTC.
They have an app to set them with, but will not work for using the phone or TV.
I chose the watch battery version.
When I went to the VA, they sent me to a local audiologist to have my hearing tested.
Then they matched the response to the individual hearing aids and programmed them.
The ear pieces were custom molded to my ears with wax impressions so they fit perfectly .....................