I bought one of these like 10 years ago for like $50. The clip on them is super tight and won’t go over more than a single layer of clothing like a T-shirt, maybe a hoodie. Battery life was about 8-hours. I use to plug in a mono-earbud and listen to the radio while I was working in a retail setting and have a free ear to listen\talk to customers, and it’d be dead by end-of-shift.
Haven’t used mine in ages, but it worked fine at the time. If you have a value for a small (size of your thumb?) bluetooth receiver, it’s not a bad choice.