New Stylish Sporty Strapless Noctilucent Heart Rate Monitor Sport Sphygmograph Pulsometer Pulse Wave Watch-Black The calorie watch is 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. Built-in ECG Pulse Sensor requires NO chest strap Inside battery life: Over 1 year under normal use (model: CR2032 or equivalent) Package included: 1 x Pulse Heart Rate Watch / 1 x User Manual