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My Watch Fails to Vibrate for Notifications or Alerts
If your watch is not vibrating, check the following:
NOTE: Device settings will vary by model. For detailed instructions, refer to your owner's manual.
Ensure that "Do Not Disturb" is turned off.
Ensure that notifications are enabled. See "Enabling Bluetooth Notifications" in your owner's manual.
Ensure that Vibration is enabled. This is typically found under Settings > System > Sounds.
Ensure your software is up to date. See - Installing the Latest Software On Your Fitness Device.