The Bluetooth icon should be displayed in the status bar next to the battery charge indicator.
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Alpha 200 Plus or Alpha 300/300i Not Syncing or Staying Bluetooth Connected to the Garmin Explore App
If you are having trouble getting the Alpha® 200 Plus, Alpha 300, or Alpha 300i dog tracking handheld to stay connected to, or sync with the Garmin Explore™ app, there are a few things to look for.