Amazon.com

Featuring a new, slim design, the F4 is packed with innovative training features to help you toward your exercise goals, including:Zone Pointer: A visible and audible feature on the display of your heart rate monitor showing your target heart rate zone and where your current heart rate is within that zone. Polar OwnCal: Shows your energy expenditure during one exercise session as well as your accumulated kilocalories during several exercise sessions. You can set daily and weekly exercise goals in terms of calorie expenditure with the OwnCal feature. Because the OwnCal tracks both the energy expenditure during one exercise session and the accumulated kilocalories during a longer time (e.g. one week), it helps in a (more…)