As if Bluetooth couldn't get more annoying, it's often difficult to even tell which version a product is using. I've spent the last 10 minutes trying to find out what version that Anker Sport speaker I have is using, and there's nothing. Just reviewers on Amazon saying "well, I think it's 4.0 maybe 4.1 but who knows?). I know my phone has v4.2, but I don't know what if anything that does for audio bandwidth or lag.