The F4 Black Thunder combines all the necessary heart rate features and is our male unit. The F4 includes the popular Zone Pointer" feature that helps keep you in your Target Zone, and OwnCal® to track the calories you burn during your exercise. With stopwatch and convenient button free operation, the F4 is a valuable fitness tool.

Features:

Polar exercise features
Wireless ECG accurate heart rate
Exercise Set (extended exercise profiles)
Polar OwnZone®
Polar OwnCal®
Polar Fitness Test™
Polar Heart rate Rest Test
Self walk test with WalkIndex
Polar OwnCode®
Polar OwnOptimizer™
Polar Keeps U Fit ™ - Own Workout Program
Target zones with visual alarm
Target zones with audible alarm
Zone Pointer
Independent CountDown / CountUp timer
Fitness Bullets (for every ten minutes in target zone)
HR max (Polar Fitness test-based)
HR max (age-based)
Interval timers
Maximum heart rate of total exercise
Average heart rate of total exercise
Minimum heart rate of total exercise
Average heart rate of each lap
Maximum heart rate of each lap
Relaxation rate during exercise
Recovery measurement (HR / time)
Automatic lap recording
Number of laps
Exercise Date
Altitude and ascent
You&I settings for two users

Running features
Speed and Distance
Speed displayed in pace, or kmph/mph
Target pace
Target pace difference
Target pace alarms
Trip Odometer
Run Distance
Time and Distanced based interval timer
Running route elevation profile
Totals mileage, kilocalories, time training

Cycling features
Trip
Speed average and max
Distance based interval
Distance based recovery measurement
Wheel size settings for two bicycles
Bike mount opt.
Speed sensor
Cadence sensor
Power output sensor
Temperature and altitude

Weight management features
Polar OwnCal®
Body Mass Index (BMI)
Fitness Bullets (á 100 kcal expended)
Polar Weight Management Program™
Weight Diary
Exercise Diary
Nutrition Diary
Program Update
Diary file

Altimeter features
Altitude with graphical trend
Vertical speed (ascent and descent rate); ave. and max.
Altitude alarms
Slope Counter
Cumulative Ascent and Descent

Barometer features
See level pressure with graphical trend
Absolute barometric pressure
Temperature
Barometric pressure drop alarm

Compass features
Bearing in degress
North indicator, cardinal points and graphical bearing indicator
Bearing tracking function
Declination setting

Mobile connectivity
Polar MobileLink™

Computer connection features
Two-way infrared data communication
SonicLink, exercise data download from wrist unit to Polar web service or SW
UpLink, settings upload from Polar web site or software to wrist unit
Polar Precision Performance analysis SW
Optional IR Interface (for RS 232 serial port or for USB port)
SonicLink, transfer of OwnIndex results and Keeps U Fit - Own Workout Program to Polar web service

Recording features
R-R beat-to-beat recording
Number of exercise files (with summaries) 1
Online recording with optional Polar IR Interface
Exercise file info page with date and time
Exercise Time (total) total
Time in target zone
Target zone limits
Average heart rate of total exercise
Last OwnIndex
Last WalkIndex
Calorie expenditure (Exercise/Total/Fat%) Exe.Tot.
Automatic Logbook with circular memory
Season totals
Recording rate
Memory left indication
Lap info
Aerobic/Anaerobic threshold summary
Fitness Exercise Diary
Fitness Exercise Diary with personal targets

Basic features
Heart rate (displayed as bpm)
Heart rate (displayed as % of maximum heart rate)
Heart rate (displayed as graphical trend)
Automatic/Manual target zone (% / bpm)
Visual and audible alarm in target zones
Water resistant 30m
Backlight
Heart touch, button-free operation of wrist unit
Heart rate sets: pre-program favorite exercise settings
Manual target zone (% / bpm) % / bpm
Automatic age-based target zone (% / bpm) % / bpm

Watch features
Time of day (12/24h) with alarm
Dual time zone
Date and weekday indicator
Stopwatch
Automatic exercise reminder (visual)
Exercise reminder (visual/alarm)
Low battery indicator
Alarm with snooze
Countdown Timer
Reminders (visual/alarm)
User replaceable battery

Language features
Display text in English, German, French and Spanish
Display text in English

Transmitter belt
Polar T31 transmitter
Polar T31 coded transmitter compatible
Polar WearLink 31 coded transmitter (changeable battery) compatible
Polar T61 coded transmitter compatible