* Never miss a beat with the HRM-Pro Plus premium chest strap heart rate monitor* Featuring dual transmission, it provides accurate heart rate data to Garmin devices, compatible fitness equipment, the Tacx Training app and other apps* It also captures running dynamics including vertical oscillation, ground contact time, stride length and more to help you improve your form and enable running power on your compatible Garmin watch* Plus, for indoor runs, HRM-Pro Plus sends pace and distance* A tool-free quarter-turn battery door makes for easy battery changes and improved durability