This combination of altimeter and heart rate monitor allows you to follow the impact of altitude and vertical ascent rate on your heart beat while hiking, mountain biking or skiing. Upper and lower heart rate limits can be set in one beat increments for target zone training. Audible and visual alarms alert you when you are exceeding pre-set limits. Crucial information can be stored for later viewing: training time, maximum, minimum and average heart rate, as well as time spent in, above and below the target zone during training.