The Polar RCX3 GPS is for recreational runners and cyclists who want integrated GPS with smart guidance. Heart rate monitor with foot pod will help you achieve your fitness goals with speed, distance and heart rate data while you train. Included waterproof Polar WearLink® Hybrid transmitter sends the heart rate signal to the training watch; comfortable chest strap secures the transmitter. Waterproof WearLink Hybrid heart rate transmitter can be worn while you swim to track your heart rate during workout sessions at the pool, lake or ocean. Coded heart rate transmission locks in a code to transmit your heart rate to the watch, thereby reducing interference from other training watches. Five preset sport zones offer an easy way to select and monitor the intensity of your training; choose between very light, light, moderate, hard and maximum sport zones. s3+ foot pod measures your speed, pace and distance while you run indoors and out; also measures your running cadence. Wear the foot pod while you're biking to measure your cycling cadence. Polar OwnCal® counts and displays calories burned during a training session; also estimates the fat-burning percentage during a workout. Create interval-guided workouts based on time, speed, distance and heart rate; interval timer is useful when workouts include different segments, such as a run/walk method. Upload your training data using the included DataLink USB stick; just plug the stick into a USB port on your Mac or PC and it detects your watch and wirelessly transfers data. Analyze your workouts at www.polarpersonaltrainer.com. Review your workout totals and weekly history with the 99 training files. Watch features include time of day (12/24 hr.) with alarm and snooze, dual time zone, date and weekday indicator, stopwatch, reminders and low-battery indicator. Water resistant to 30 meters (100 ft.).