I just got an old Garmin Edge 520. It seems to work absolutely fine other than it does not connect to my iPhone 13 Pro. My iOS is 15.5 and Garmin firmare
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How to connect and pair a Garmin watch to your smartphone
How to connect and pair a Garmin watch to your smartphone
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Bluetooth heart rate chest strap for Garmin, iPhone and Android / for measuring the heart rate on your smartphone with Strava, Endomondo, Runtastic Pro and many more. : Amazon.de: Sports & Outdoors
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Heart Rate Monitor Bluetooth 4.0 Polar Garmin Heart Rate Chest Strap Band Fitness Monitor for Runtastic Strava Endomondo Wahoo|Outdoor Fitness Equipment| - AliExpress