Heart Rate Monitors

Body Basics provides all the essential accessories to enhance your work-out performance and evaluation. Shop Body Basics for heart rate monitors, scales, cable gym attachments and much more.

Polar RS300X SD

For enthusiast runners

You want to go for a run and know how speed and distance can aid your performance. Without heart rate, you can only get so far. The RS300X combines these three to give you a true understanding of the effort you put in. And on top, all the essential heart rate features come along RS300X, on the run and online.

In the Box:

  • Polar RS300X
  • Polar WearLink®+ transmitter
  • Polar S1 foot pod™
Manufacturer: Polar
Model: RS300x
Warranty: 2 Years
MSRP: $249.95
Basic features
  • Automatic/Manual target zone (% / bpm / HRR%)
  • Backlight
  • Display zoom
  • Easy start (setting wizard)
  • Event Countdown Timer
  • Graphical target zone indicator
  • Heart rate (displayed as % of maximum heart rate)
  • Heart rate (displayed as bpm)
  • HeartTouch™, button-free operation of wrist unit
  • KeyLock
  • Over-sized display
  • User configurable displays
  • Visual and audible alarm in target zones
  • Water resistant - 50m
  • two lines
Cycling features
  • Bike mount - opt.
Data transfer
  • Compatible with polarpersonaltrainer.com with Polar FlowLink
GPS features
  • Battery type - opt.
  • Full power mode (up to 30 hours with an optional lithium battery) - opt.
  • Low battery indicator - opt.
  • Low power battery mode - opt.
  • SIRF-III chipset - opt.
  • Shock resistant - opt.
  • Speed and Distance - opt.
  • WAAS support (wide area augmentation system) - opt.
  • Water resistant - opt.
Language features
  • Display text in English, German, French and Spanish
Polar exercise features
  • Automatic lap recording - opt.
  • Average heart rate of each lap
  • Average heart rate of total exercise
  • Exercise Date
  • Exercise Set (extended exercise profiles)
  • HR-based target zones with audible alarm - 3
  • HR-based target zones with visual alarm - 3
  • HRmax (Polar Fitness test-based)
  • HRmax (age-based)
  • Interval trainer (HR, pace, distance) guided workouts
  • Maximum heart rate of each lap
  • Maximum heart rate of total exercise
  • Number of laps - 99
  • Polar Fitness Test™ with OwnIndex®
  • Polar OwnCal®
  • Polar OwnCode® (5kHz)
  • Polar OwnZone®
  • Polar sport zones
  • Speed-based target zones with visual and audible alarm - opt.
  • Wireless ECG accurate heart rate
  • ZoneLock
  • ZonePointer
Recording features
  • Average heart rate
  • Calorie expenditure - exe.total
  • Exercise Time (total)
  • Exercise file info page with date and time
  • Lap info
  • Last OwnIndex
  • Maximum heart rate
  • Number of exercise files (with summaries) - 16
  • Target zone limits
  • Time in target zone
Running features
  • Distance summaries
  • G1 GPS Sensor - opt.
  • Run Distance
  • S1 foot pod™
  • Speed displayed in pace, or kmph/mph
  • Speed/Pace and Distance
  • Speed/Pace summaries
  • Speed/Pace target zones
  • Target pace
  • Target pace alarms
  • Time and Distanced based interval timer
  • Totals mileage, kilocalories, time training
  • Trip Odometer
Transmitter belt
  • WearLink®+ 31 coded transmitter (changeable battery)
Watch features
  • Alarm with snooze
  • Date and weekday indicator
  • Dual time zone
  • Low battery indicator
  • StopWatch
  • Time of day (12/24h) with alarm