RS800SD Heart Rate Monitor/Speed Distance Monitor features: Polar S3 Stride Sensor W.I.N.D: Foot pod measures accurate speed and distance. User-changeable battery and water resistant. Compatible with adidas adiStar Fusion shoe WEARLINK W.I.N.D: Disturbance free chest transmitter with 2.4GHz transmission Running Cadence: Helps you find a balance between leg power and leg speed Running Index: Gives you daily information about your performance to help you improve running efficiency and economy Polar ProTrainer 5: Advanced training software helps you create detailed training programs transferable to your Polar Running Computer via infrared ECG accurate Heart Rate: Easily monitored absolute (bpm) and relative (%HRmax) helps you train at your desired intensity Polar Fitness Test with Own Index: Predicts your maximal oxygen uptake based on several variables OwnOptimizer: Indicates the status of your training load Online Running Coach: Online training program and diary Interval Trainer: Allows you to create and name your favorite time and/or heart rate 99 memory files: Automatically stores all data from your last 99 runs 99 laps with total recall: Recalls lap time, split time, heart rate and average heart rate Polar Sport Zones: Helps you select and monitor the intensity of your training Altimeter: Displays and records altitude information and counts total meters climbed Water resistant to 50m: Not waterproof, not suitable for use when swimming