SODIAL(R) Sport Pulse Heart Rate Calorie Counter Watch with Monitor Black The first and only watch that can calculate your heart rate and calories burned while exercising without the need of a chest strap It has been designed to calculate the calories burned and pulse rate of an AVERAGE. Individual based on preset age, weight, and sex Based on your preset information memorized by the watch, the time on the counter, and your heart rate, the calorie watch is able to determine how many calories you have burned during your workout