Sigma Onyx Pro Hrm

Digitally coded Heart Rate Monitor 4 heart rate functions and 6 time functions, including countdown and alarm Training mode based on max HR or individual anaerobic threshold (IAT) 3 pre-programmed endurance training modules and 1 programmable endurance training module 2 pre-programmed interval training modules (time or pulse driven) and 1 programmable Training mode with 3 adjustable HR zones Marathon Competition Counter and Lap Counter (50 laps) Total values per week, per month and since reset Memory for 7 training sessions Quick change battery compartment enables battery replacement by user