Your device is compatible with the HRM-Pro™ accessory. The HRM-Pro accessory is a chest heart rate monitor that you can pair with compatible devices using ANT‍+^® and Bluetooth^® technology. You can wear the heart rate monitor to record heart rate data and receive real-time feedback on your running form (Running Dynamics). The heart rate monitor's activity tracking feature records your step count, calories, intensity minutes, and all-day heart rate. You must pair the heart rate monitor with your device to view your heart rate data. If your MARQ^® device was packaged with the HRM-Pro accessory, the devices are already paired. See the instructions for your HRM-Pro accessory for more information (garmin.com/manuals/hrm-pro).