Timex Men’s T5K736 Zone Trainer Digital HRM Flex Tech Chest Strap & Full-Size Gray/Black Watch

Audible and visual target zone alarms; 12/24-hour clock with day/week indicator
Polar OwnCal mode tracks energy expenditure for single and accumulated workouts
Offers EnergyPointer and ZonePointer modes; water-resistant to 30 meters; 2-year warranty

Replacement elastic strap for HRM in size small
This soft elastic strap allows your wireless heart rate monitor to fit comfortably around the chest.

Pulse Rate Measurement (BPM) – Measures the number of heart beats per minute. A normal adult pulse rate while resting is between 60 and 100 beats per minute.
Oxygen Saturation (SpO2) – Oxygen saturation is a measure of how much oxygen the blood is carrying as a percentage of the maximum it could carry. Measuring saturated hemoglobin is a useful screening tool for determining basic respiratory function.
Perfusion Index (PI%) – Perfusion index is an indication of the pulse strength at the sensor site. The PI?s values range from 0.2% for very weak pulse to 20% for extremely strong pulse

Unique training benefit feature provides instant feedback after your workout. Comes with the New Polar H3 Heart Rate Sensor.
Helps you train at the right intensity and improve your run with personal sport zones and the Running Index feature
Compatible with s3+ stride sensor for running speed and distance, cycling CS speed and cadence W.I.N.D. sensors and the G5 GPS sensor