I use a continuous glucose monitor. I've been using a hand held reader because the android app wasn't FDA approved. Well, the android app just recently got approval so I downloaded it last week. Changed out my sensor today and initialized it with my phone.
Found out the hard way that the low glucose alarm overrides mute and volume settings, can't be turned off, and can't be adjusted in any form. It's not uncommon for me to go below the low glucose threshold by a few points at night but I'm hyperglycemic and it's virtually impossible for me to go dangerously hypoglycemic on my current meds.
Once a sensor has been initialized by the phone or hand held unit it cannot be read by any other device other than the one that initialized it. A sensor lasts two weeks. This alarm is really going to piss me off.