Timex Ironman T5C401 Unisex 30-Lap Digital Fitness Heart Rate Monitor Watch Sports timing watch with heart rate monitoring; sized for both men and women Chest strap heart rate monitor works with watch to provide target zones and time in zone Recovery heart rate timer; displays calories burned 100-hour chronograph; 30-lap memory; 100-hour, 3-mode countdown timer Watch is water resistant to 50 meters (165 feet); up to 3-year battery life