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1 comment of this product found across Reddit:
tts971 /r/orangetheory
4 points
1970-01-20 11:36:58.326 +0000 UTC

XUXIN Universal Replacement Heart... https://www.amazon.com/dp/B07L1Q2GNY?ref=ppx_pop_mob_ap_share

I’ve bought two of them in the last month to alternate. They definitely work with the OTF chest monitor and a great price, too.