not state of the art bt headset but can confirm is in good working order, only slack part is that you have to stuff is in your ears rather than clinging to your ears. Thats why it has a matching neck strap, so you can hang it around the neck.
I'm currently using sports abs + sport springs.. before was using standard abs with the same sets of springs.. the problem is before i change into the sport abs there knocking sound on the right side of the abs...