Let your heart rate monitor guide you like a personal trainer. The a3 has the new Zone Pointer feature that helps keep you in your Target Zone. Every exercise in your TZ puts you one step closer to your goal. File storage allows you to view previous workout data to help establish goals for your current workout. Features: Continuous HR, Zone Pointer - visually guides you within your TZ, Auto/Adjustable HR Limits, % of Max HR, fitness bullets - visual indicator of exercise time spent in TZ, exercise timer, watch functions, and 1 storage file.