I’m going on 3.5 years with my Garmin HRM Dual and it’s been flawless for me, both indoor and outdoor riding. 2 battery replacements and that’s been it. I do follow their washing instructions and throw the strap (without the transmitter) in the wash every 1-2 weeks with my other cycling gear (cold water, no dryer and hang to dry) and have had no issues.
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