Timex Ironman Men's Road Trainer Heart Rate Monitor Watch, Black/Orange, Full Size Mid-sized fitness training watch with heart rate monitor and comprehensive training tools Digital transmission prevents cross-talk with other monitors and electronic equipment Preset a target heart rate zone with six ranges; analyze time in/out of zone, recovery time, peak heart rate, and average heart rate 100-hour chronograph with lap and split; 50-lap memory; 100-hour, 2-mode countdown timer; alarm with 5-minute backup INDIGLO night-light with NIGHT-MODE; owner-replaceable battery; Data Recorder 2 and Data Recorder compatible; water resistant to 100 meters