The Garmin Premium ANT+ Heart Rate Sensor (Chest Strap) keeps a close eye on your heart rate. The soft chest strap of the Premium Heart Rate Sensor is much more comfortable than the standard Garmin chest strap. Wear it around your torso, and it immediately measures the rate of consecutive heart beats. Your heart rate is shared with your Garmin GPS device, so you can keep and eye on your most vital bodily function. The Garmin heart rate sensor is an indispensable accessory for the sporty navigator.