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A serious training tool, the ECG5 has display and memory functions to help you get the most out of every workout. Features include: current heart rate, Target zone setting in one-beat increments, Time in training zone display, Records total exercise time, Audible/visual out-of-zone alarm, Calorie counter, 48-lap/total time/stopwatch, Target memory, Average heart rate or workout Average heart rate for each lap, Time of day, Date/day calendar, Stopwatch, 20-hour countdown timer, 24-hour daily alarm, Night Vision illumination, Bicycle handlebar mount. engineered to be more comfortable on slimmer wrists.