Polar RS300x G1 Heart Rate Monitor Simple-to-use wrist heart rate monitor/training computer in black helps you to train at the right intensity Includes G1 GPS Sensor for tracking routes and WearLink+ 31 coded transmitter Provides metrics for heart rate, speed, distance, pace, and calorie burn OwnZone feature for individualized zone training by heart rate or pace, a fitness test, and auto lap splits Compatible with S1 foot pod