Go to your Bluetooth Settings to confirm that you are connected to both JBL Reflect Fit Audio and JBL Reflect Fit HRM. Once you are connected to the Reflect Fit HRM you will hear the audio voice prompt state, "Searching for Heart Rate"......"Calibrating" followed by a heart beat prompt. It will calibrate for 2-5 seconds followed by "Heart Rate Detected". If it cannot verify your heart rate, the audio voice prompt will advise you to adjust the ear piece. Once it has established your heart rate, you will be able to manually check your heart rate by pressing the heart button located on the RIGHT arm of the neck band.