Displays heart rate only - Not a time-keeping device. Entry level heart rate monitor to track your heart rate. Continuous heart rate - at rest, play or during your workout. Simple, one-button operation. Large easy-to-read digital display. Automatic activity timer. Recall average, peak and minimum heart rate (for workout). Water resistant to 30 meters. Personal Heart Rate Sensor Features: Comfortable lightweight strap. Owner-replaceable battery. Water resistant to 30 meters (sensor will not provide accurate heart rates when under water).