The FT4 is an entry-level heart rate monitor and replaces the ever popular F4 Heart Rate Monitor. It looks and works as a digital wrist watch with dual time zones, date of the day and alarm features. It also comes with a chest strap that measures your heart rate and transmits wirelessly it to the watch. Wear it when you go for a brisk walk, jog, or yoga session. An alarm will sound if your heart rate falls outside the desired zone – which is a balance between cardiac safety and an effective workout. Basic Features Automatic age-based target zone (% / bpm) - %/bpm Automatic/Manual target zone (% / bpm / HRR%) Backlight 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 Manual target zone (% / bpm) - %/bpm Visual and audible alarm in target zones Water resistant - 50m Language Features Display text in English, German, Finnish, French, Portuguese, Spanish and Italian Exercise Features Average heart rate of total exercise Exercise Date HR-based target zones with audible alarm HR-based target zones with visual alarm Maximum heart rate of total exercise Polar OwnCal® Polar OwnCode® (5kHz) Wireless ECG accurate heart rate Recording Features Average heart rate Calorie expenditure Exercise Time (total) Exercise file info page with date and time Maximum heart rate Number of exercise files (with summaries) Target zone limits Time in target zone Transmitter Belt Polar 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 User replaceable battery