Polar RS800CX Run Heart Rate Monitor Watch with S3 Stride Sensor W.I.N.D. Sophisticated training watch designed for dedicated, multi-sport endurance athletes Integrated Polar ProTrainer 5 software lets you create custom GPS routes and maps Displays heart rate as percentage of maximum, bpm, and within target zone indicator Includes S3 Stride Sensor W.I.N.D. to help optimize daily running workouts Built-in altimeter for altitude analysis; 12/24-hour clock; 2-year warranty