Heart Rate While Swimming
The device is intended for surface swimming. Scuba diving with the device may damage the product and will void the warranty.
The watch has wrist-based heart rate enabled for swim activities. The watch is also compatible with chest heart rate monitors such as the HRM-Pro™ series accessories. If both wrist-based heart rate and chest heart rate data are available, your watch uses the chest heart rate data (Chest Heart Rate While Swimming).