Whatever your sport, the Suunto Smart Sensor measures your heart rate. It is compact, comfortable and accurate. While swimming, the sensor can store your heart rate data and transfers it wirelessly to a compatible watch or Suunto's Movescount App. Pairing the sensor with the Movescount App, you can also analyze, relive and share your moves to make every move count. It can also be used on its own when attached to Movesense compatible sports apparel.