iPhone and Android compatible heart rate monitor https://boingboing.net/2017/10/25/iphone-and-android-compatible.html …pic.twitter.com/tn4F4i1TLm
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iPhone and Android compatible heart rate monitor https://boingboing.net/2017/10/25/iphone-and-android-compatible.html …pic.twitter.com/tn4F4i1TLm