Heart Rate Monitor (wireless ECG/EKG measurement) Analog Transmission (works with most gym equipment) BPM (heart rate measured in beats per minute) Target Heart Rate (graphic and audible alerts) Training Zones (set personalized target HRM to maintain) Chronograph (1/100th sec accuracy) Alarm (daily alarm with audible alert) Elastic Chest Strap (comfortable and machine washable) 5 ATM Water Resistant (approx 50 Meters) The Beat Goes On on back plate