ECG-acurate, Provides accurate heart rate data. A runners chronograph (stopwatch). Shows lap and split (total) time. Introducing the Benson button. While running, you can stay in RUN mode, and press this button to see other views. Lap and split times, or heart rate. One heart rate zone. You select a high and a low heart rate. The watch beeps outside the zone, and at the end of a run, tells you how long you were able to stay in the zone. 50 lap memory, average heart rate, and see how long you spent in your heart rate zone. Features a 2 segment interval timer. Great for a walk/run marathon, or for doing speed work with recovery sessions. Tells the time, date, and has one alarm. Battery hatch on watch and chest strap. Easy battery