Timex Ironman Target Trainer TapScreen Heart Rate Monitor & Watch Flex-Tech digital sensor eliminates heart rate monitor cross-talk and electronic interference Three-workout chronograph memory - 200-Lap total with average heart rate per lap Two interval timers - each segment with its own target zone and label Target time pacer gives visual and audible feedback when laps are logged based on user settings. Pace and time difference from lap target time displayed. Hydration and nutrition alerts remind athletes to replenish at regular intervals Indiglo Light-Up Watch Dial Indiglo Night-Light Target Heart Rate Zones including Time in Zone Average Heart Rate for Workout and Lap Water-resistant to 330 feet (100 M) TapScreen Technology.Style number T5K726F5 is the combination of two separate components (the watch T5K543 and the HRM Strap)