4iiii Viiiiva Heart Rate Monitor
Trusted by pros and enthusiasts alike, Viiiiva products are 10x more sensitive than most heart rate monitors, 5x more responsive, uses advanced beat-to-beat measurement and can store up to 65 hours of data. They also collect and transfer data from your other ANT+ products via Bluetooth to your iOS or Android device. Viiiiva products are comfortable and easy to wear, featuring a soft, flexible strap for a perfect fit.
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