Note: This product comes bundled with an HRM-Run heart rate monitor with either a black front or a black front with a red border around it. The border color will not affect the functionality of the unit.RUNNING DYNAMICS When paired with the HRM-RunTM monitor, the Forerunner 920XT provides feedback on running form by measuring cadence, vertical oscillation and ground contact time.METRICS THAT MATTER Record speed, distance, ascent/descent, grade and more. Pair with ANT+ compatible sensors to measure heart rate4, speed, cadence and power. Control VIRB Elite action camera4 to record and relive your accomplishmentsSMART NOTIFICATIONS See incoming email, text messages, call alerts, calendar reminders and more from your compatible smartphone.VO2 MAX, RECOVERY TIME & RACE PREDICTOR Forerunner 920XT estimates VO2 max, recovery time and predicts your race times for several distances when used with heart rate. When used with a power meter, it estimates VO2 max for cycling as well.