DESC: Features and BenefitsTarget Zone Indicator --Indicates when you are above, below, or within your heart rate target range.Heart Rates--Records average and maximum heart rate for workout. Target Zone : Out-of-Zone Alarm--Provides you with an audible and visual out-of-zone alarm to alert you. Calories Burned--Polar's OwnCal technology measures the number of calories you use during your workout. OwnZone--During your warm-up, Polar's technology analyzes your heart's beating to determine a safe and effective heart rate zone for you---your OwnZone. Using this info, the monitor provides two levels of intensity guidance for your workout, indicated by blinking and sounding alarms.Key SpecsTime of Day --Stopwatch--Elapsed Exercise Time--Receiver Water Resistant: Up to 30 Meters