With the HRM-Pro Plus heart rate belt, you get the exact information you need to challenge your limits and achieve your goals in both indoor and outdoor training. HRM-ProPlus sends real-time heart rate data to compatible devices, fitness equipment and apps. Changing the battery is easy, because the door opens without tools, and the battery life is up to 1 year. By connecting to your compatible Garmin smart watch, you get pace and distance information from your indoor run. No, it's not just a heart rate monitor. You can also use dynamic running data to improve your running style (requires a compatible Garmin smartwatch). Don't have a watch on your wrist? HRM-Pro Plus records, for example, steps, calories burned and power minutes.