The a5 fitness tool combines exercise guidance with valuable feedback about your workout. A built-in walking test (Self Walk Test) will tell you how fit you are and help you set up your exercise program. The ZonePointer will keep you in your Target Zone, and the OwnCal calorie counter will help you manage your weight loss program. It also tells you how efficient your workout was by tracking your time in zone and total calories. The a5 is your personal fitness manager. Features: Continuous HR, Self Walk Test, Zone Pointer - visually guides you within your TZ, auto/adjustable HR Limits, OwnCal, % of Max HR, fitness bullets - visual indicator of exercise time spent in TZ, exercise timer, watch functions, backlight, and more.