Dexcom G7 Instructions Manual page 70

Each alert has its own settings. All of those settings are explained here:
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Delay 1 Alert (High alert only): Turn on to delay your first alert until your sensor reading is at
or past the high alert setting for a while. You choose how long.
For example, if you set Delay 1
or above your high alert level for 20 minutes before you get the alert.
For More Than: Don't get an alert until a system issue lasts this long. You choose how long.
Fall Rate: For the Falling Fast alert, you choose the sensor reading change rate:
2–3 mg/dL per minute or
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3 mg/dL or more per minute
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For example, if you turn this on, when your glucose falls fast, you'll get an alert.
You can add a glucose level to this. If you do, you'll get an alert when your glucose is at or below
that level and falling fast.
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Alert to 20 minutes for your High alert, your glucose must be at