Here is another waterproof armband hard rate monitor that lets you closely monitor your performance. The RHYTHM 24 has a 24-hour battery life, five changeable training zones, and on-board data recording, including HRV. The device measures blood flow and movement to calculate heart rate and calories burned.
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The RHYTHM 24 is compatible with RunKeeper, Strava, and other apps. It support Bluetooth and ANT+. More info is available here.
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