The Oregon Scientific Gaiam Zone Trainer 3.0 is a watch with digital time, calendar, stopwatch, Kcal and fat reading to tell you exactly how many calories your burning and allows for continuous heart rate monitoring to accurately measure the effectiveness of your workouts. Its black silicone strap is designed for the ultimate in both comfort and fashion with a soft, breathable band that minimizes irritation caused by sweat. The included fabric chest belt is coded to wirelessly transmit continuous heart rate data right to your tap-on-lens watch display. Brand: Oregon Scientific Inc Model: SE331M Features: Fashionable black and white multi function watch and heart rate monitor Comfortable flat design black soft silicone strap band with aeration to minimize irritation from sweat Easy to read quality LCD display with large characters 12/24 hour with hour/minute time format DD.MM.YY or MM.DD.YY date format 2010 - 2059 year range Stopwatch Water resistant up to 164 feet Kcal and fat reading tells you exactly how many calories your are burning Calorie range is 0 - 9,999 kcal Maximum 99 records memory Tap on lens design for toggling through your favorite modes to view exercise data with the tap of a finger Heart rate monitor will measure the effectiveness of your workout Target heart rate zones: 50-60%; 61-70%; 71-80%; 81-90%; 91-100% Fabric chest belt is coded to wirelessly transmit continuous heart rate data right to the tap on lens watch display Operating temperature is 32 - 104 F for the watch and 41 - 104 F for the chest belt Storage temperature for both watch and chest belt is -4 to 140 F Watch is powered with 1 CR2032 3V lithium battery Chest belt is powered with 1 CR2032 3V lithium battery Instruction manual included 1 year limited manufacturer warranty