Heart Rate the Easy Accurate Way This premium heart rate strap transmits realtime heart rate data over ANT connectivity and BLUETOOTH Low Energy technology giving you more options to train indoors, outdoors or even online. With it you'll be able to consistently receive accurate heart rate on your Garmin device in online training apps such as Zwift or even the compatible fitness equipment in your favorite class at the gym. So however you like to train you'll get the accurate realtime heart rate you need to take your performance to the next level.