Garmin Fitness - HRM-Pro transmits real-time heart rate data. It also tracks running dynamics that can help you improve your running form. And that makes this one impressive little strap. Shop now:
Garmin HR Strap Battery Replacement - YouTube
Garmin HRM-TRI & HRM-SWIM In-Depth Review | DC Rainmaker
DIY guide to change battery : Garmin HRM Tri / Run / Swim Chest Strap - YouTube
How long do HRM-Tri batteries last? – Chris Worfolk's Blog