Timex Ironman Triathlon Heart Rate Monitor (T5H881) model provides Digital transmission. Digital transmission eliminates interference from other monitors. Additional feartures include a Calorie counter to measure Caklories burned during workout. Zone Trainer displays if you are in the target zone. %-of-Max displays Heart Rate in % format or Beats per Minute (BPM). Full function watch with Indiglo backlight for night time usage.

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Features:

INDIGLO#&174 night-light

100-hour chronograph

27-lap memory

100-hour countdown timer

Alarm with 5 min back up

Water resistant to 50m

3.5 Year Battery Heart Rate Features:

Target zones

Zone trainer

Average heart rate

Time in zone

Calories burned

Recovery timer

Max heart rate

Digital transmission

Data Recorder compatible