Polar A3 HRM

this description from Amazon says it does.... last sentence first paragraph.

Offering a step up in features from the F1, the Polar A3 heart rate monitor offers manual and automatic heart rate limit settings and personal target heart rates, in addition to display of current/average heart rate, exercise time, and time of day. You can use the A3 monitor to conveniently view your heart rate while walking, swimming, cross-country skiing, or any other exercise without disturbing your exercise rhythm. It comes with the A3 wrist unit (which resembles a watch), a transmitter that's worn comfortably around your chest, and an elastic strap to hold the transmitter in place. The Polar A3 offers a step up in features, including a self walk test and a calorie counter.

The A3's visible and audible Zone Pointer feature on the monitor's display shows your target heart rate zone and where your current heart rate is within that zone. The Fitness Bullets feature shows a bullet on the monitor's display for every 10 minutes spent exercising/training in your target heart rate zone. The Time in Target Zone feature calculates the amount of total exercise time spent in your personal target zone. You can use this feature together with the Total Exercise Time to determine the effectiveness of your exercise program.