Bowflex Fitwatch Strapless Heart Rate Monitor with Built in Compatible Chest Strap App (Black/Gray) Accurate Strapless heart rate,on demand heart rate with buttonless sensor technology, compatible with most ECG Chest Belts Hi/Lo Target Zone alarm, Recovery timer, Calorie Counter Total Fat burn, Time of Day/Alarm Clock, % of Max Heart rate Average HRM, Maimum HR, 100 Hour Stopwatch Water Resistant, Backlight