Garmin Swim 2 Watch – Slate | 010-02247-11XSee your heart rate on your wrist, no strap needed.Get pacing alerts, logging drills and everything you need to advance your swim.Know when to slow down or speed up with Critical Swim Speed.Your watch automatically stops when you do done and done.Do it your way when you design your own workouts.Battery life for the whole week. Thats up to 7 days for those counting.