Dexcom G7 User Manual page 120

Second Alert Profile: Check Schedule to make sure you're using the alert profile
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you expect. For more information, go to the
Phone and smartwatch speakers: See your smart device product instructions to
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test the speaker.
Bluetooth speaker, earphones, etc.: Verify you're getting your alerts where you
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want them.
Issue
Your receiver doesn't make a sound when you get an alert.
Solution
Here are some items to check if you can't hear alerts:
Receiver is on: Verify that the receiver is on.
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Alert sounds:
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Make sure you aren't using Silence All or Vibrate Only. For more information,
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go to the
Change your alert sounds to one you can hear easily. For more information, go
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to the Alerts
Test speakers: Test your receiver speakers regularly by plugging in the receiver
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to charge and following the speaker test instructions on the screen, or go to Menu
> Information > Receiver > Speaker Test.
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Alerts chapter.
chapter.
Alerts chapter.