Never been used , paid £99 .
Basic Functions of Polar S150 Cyclists Heart Rate Monitor
Water resistant to 30 meters
Independent CountDown / CountUp timers
Age-based HRmax or personally entered Max HR if you know it.
Heart Rate displayed as BPM or % of Max HR
Target zones (3) with visible and audible alarms. Ability to switch between zones while training, great for intervals or varying intensity.
Recovery function, time based or heart rate based.
Lap times with heart rate, split time and cummulative time (x 60)
Average heart rate of each lap and heart rate at end of each lap
Stopwatch
Calendar