Garmin HRM 3-SS will connect/pair with forerunner 35 but will not show heart rate (see picture) - Accessories & Sensors - Running/Multisport - Garmin Forums
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Garmin Hrm-pro 245 745 945 Fenix6x Bluetooth Ant+ Dual-mode Heart Rate Sensor Running, Swimming, Cycling Heart Rate Belt - Electric Bicycle Accessories - AliExpress
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