Optical Wrist Based Heart Rate versus Chest Straps Gallery Optical Wrist Based Heart Rate versus Chest Straps Featured, Product Reviews Optical Wrist Based Heart Rate versus Chest StrapsIts been a year now since the first wrist based [...]By Raf|2016-03-15T20:11:56-06:00January 5th, 2016|Featured, Product Reviews|3 Comments Read More