Timex Ironman Triathon Heart Rate Monitor for smaller wrists. Whether training for a 10K race or exercising to lose weight, the Timex Digital Heart Rate monitor helps you make the most of your workouts. Target heart rate zone with optional alarms. 5 target zones based on max heart rate. Recovery rate timer. Calories burned. Display with flipping system for easy reading. 100-hour chronograph with lap and split 30-lap memory with average heart rate. 100-hour, 3-mode countdown timer. Month/day/date with 12/24 hour time. Alarm with 5-minute backup. INDIGLO night-light with NIGHT-MODE feature. Double-shot polyurethane strap. Water resistant to 50 meters.

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Features:

Digital FM transmission for clear signals around exercise equipment and power lines

Synchronized transmission prevents crosstalk from other heart rate monitors

Continuous heart rate readings even during the most intense activities

Comfortable and lightweight with adjustable elastic chest strap

Sensor Water-resistant to 30m (Sensor will not provide accurate readings when under water) Owner-replaceable battery - Unlike many other heart rate monitors, all Timex Heart Rate Monitor sensors have batteries that can be replaced by consumers without requiring them to be returned to the manufacturer

Data recorder compatible.