Whether for indoor or outdoor training, the precise data from the HRM-Pro Plus heart rate chest strap helps you test your limits and achieve your goals. The HRM-Pro Plus transmits heart rate data in real-time to compatible devices, fitness equipment, and apps. The battery lasts up to a year and can be easily replaced without tools. Connect the device to your compatible Garmin smartwatch to receive pace and distance data while running indoors. This heart rate chest strap can do more than you think.