Polar Rs300X Heart Rate Monitor: * Automatic/Manual target zone (% / bpm / HRR%) * Backlight * Display zoom * Easy start (setting wizard) * Event Countdown Timer * Graphical target zone indicator * Heart rate display: as % of maximum heart rate * Heart rate display: as bpm * Heart Touch, button-free operation of wrist unit * KeyLock * Oversized display * User configurable displays * Visual and audible alarm in target zones * Water-resistant: 50m * Compatible with polarpersonaltrainer. com with Polar FlowLink * Display text in English, German, French and Spanish * HR-based target zones with visual and audible alarm - 3 * HRmax (age-based) * Interval trainer (HR, pace, distance) guided workouts * Number of laps: 99 * Polar Fitness Test with OwnIndex * Polar OwnCal * Polar OwnCode (5kHz) * Polar OwnZone * Polar sport zones * Wireless ECG accurate heart rate * ZoneLock * ZonePointer * Number of exercise files (with summaries): 16 * G1 GPS Sensor, optional * Polar S1 foot pod, optional * Polar WearLink-coded transmitter (changeable battery)