Ekho Heart Rate monitor watches come standard with watch face and features, heart rate monitor transmitter, and manual. The E15 offers Continuous heart rate, Average heart rate, Maximum heart rate, Target Zone, Out of zone visual alarm for high/low target zone, Audible alarm OFF mode, Calories Burned, Time/Date, Stopwatch/Exercise time, Water Resistant, Large display, ECG Accurate, User changeable batteries, Interfaces with heart rate interactive exercise equipment.