When paired with high sensitivity IEMs like SE535s the default volume is ear-piercingly loud, so the initial voice that says "POWER ON!" and "CONNECTED!" and the beeps when it turns off are so loud that I'm worried they could damage my hearing. There's no way to disable them, so I've been making sure they aren't in my ears when I turn them on or off. Just a short while ago I discovered when turning them on if you time it right you can press the volume down button just as the voice prompt is about to play and it silences it. As far as I can tell it doesn't support software updates and shure support have yet to respond about the issue. Any potential fix is likely to involve sending it away if they'll even do anything at all. Other than that, it sounds nice despite only supporting the SBC codec, bluetooth connection works very well and the battery life is way over what they promise. It's rated at 8h but I regularly get well in excess of 12h. I turned mine on this morning around 7am, used them all day with the odd break and they still work now at 9.30pm. Oh another annoyance - when the battery gets low they start with more deafening voice prompts "BATTERY LOW!" every 30 seconds, which you can't disable. A decent product let down by appalling software. I really hope Shure will agree to do something about it because they specifically advertise compatibility with SE535 but I'm pretty sure if you used these every day without avoiding the voice prompts you would end up damaging your ears.