50M Water Resistant / Displays calories burned / Shows average heart rate / Alarm mode with 5-Minute Backup / Chronograph / Indiglo # Includes Digital Heart rate sensor # INDIGLO lets you view clock at night or in dark areas # 100-hour chronograph # 100-hour countdown timer # Alarm with 5 minutes back up # Water resistant to 50m - for jogging in the rain or swimming # Selectable fitness target zones # Zone trainer - Alarm notification when you are not in zone # Automatically sets your five training zones + one manual zone # Displays average heart rate; Time in zone; Calories burned # Recovery timer # View maximum heart rate # Uses digital transmission # 17 Lap Memory with average heart rate per lap # Month/day/date with 12/24-hour time select # Up to 3-year Battery life with included battery (varies depending on use of features) # Unisex