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Pair the SUUNTO Smart Sensor with any compatible SUUNTO or Bluetooth-enabled device to track your heart rate data in real time as you train. This compact strap fits comfortably around your chest and begins sending data as soon as it's paired with your device. It's water-resistant up to 98', so it can track HR data in the pool or if you're out in the rain. In addition to Bluetooth-ready devices, the Smart Sensor also supports SUUNTO's Movescount App, which lets you store and revisit your activity data. The Smart Sensor operates on a CR2025 coin-cell battery that yields up to 500 hours of use.