The sensor is described as "Optional Alarms" and that is a lie. I'm very disappointed. I'm deleting this app once my current sensor is done. I can't take being up all night because it can't recognize that I'm not low anymore and will alarm very loudly making sure that my wife and baby also are awake. Tonight was the last straw, I've been up for hours for a false low and will get to wake up hyperglycemic for the sole purpose of being able to get some sleep. Allow vibrations and I'll try again.