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The faceplate is held in place with magnets and in the screen-used helmets, magnets were also placed on the top of the helmet to hold the faceplate in the open position
Optical HR Accuracy Geekfest: Of course, no amount of pretty blue lights mean anything if the unit actually doesnt measure heart rate accurately
#9 It's most likely a B4
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The removable liner makes cleaning easy, maintaining freshness after extensive use
