Timex Ironman T5F001 Unisex 100-Lap Target Trainer Heart Rate Monitor Watch. Timex Ironman Triathlon Heart Rate Monitor with an extra large resin strap and digital display, INDIGLO night-light, Water Resistant to 50m, Timer. Dual Time Zones, 100 lap recall, 100 hour, 3 mode countdown timer, 5 alarms, Target zones, Average heart rate, Time in zone, Maximum heart rate, Four linked interval timers, Recovery heart rate timer.