Edit 11/19/20 - Edited for accuracy. The sound corresponds to the flat frequency response curve on the description page. I am not straining my voice because I cant hear. The finish is very nice. This product is ingenious. The first pair was sized XL mens, it lasted about 6 years. Update 19 Apr 2021 - I was looking up a link to this book to forward it to another person and saw my review. Ill return them. The case plugs into the wall to recharge that and the headphones when needed. After my second cycling crash, the same urgent care doctor who saw me the first time wrote me a prescription.