Garmin Unisex Black Accurate Heart Rate And HRV Data Running Dynamics Stand Alone Activity Recording M XL HRM 600 Premium Heart Rate Monitor 010 13383 00 Gender_ Mens The Auto shot round analyzer The Auto shot round analyzer measures and auto records detected shot distances(lie and ball contact may affect shot tracking) and pairs with optional Approach CT10 club tracking sensors (sold separately) for more automatic game tracking capabilities Exterior molle loops to attach accessories Comfortable machine washable strap is available in two sizes (XS–S and M–XL) for the most ideal fit for your body type Provides and stores accurate heart rate data during swim activities and syncs it to your compatible smartwatch after you save your workout