Watch Features: 100-lap memory, including heart rate, lap time and split time; Display with flipping system for easy reading of heart rate and elapsed time; Total time in target heart rate zone; Average heart rate in target zone; Average heart rate for workout; Age-based heart rate target zone calculation option; 100-hour chronograph with lap or split; 100-hour countdown timer with; stop at end, repeat at end or chrono at end; Month/day/date; 12/24 hour time; Alarm with 5 minute back-up; INDIGLO� night-light;Larger display with new font; All-day-white reflector display; 2 year battery life; Watch � Water-resistant 50 meters. Digital Heart Rate Sensor features: Digital FM transmission for clear signals around exercise equipment and power lines; Synchronized transmission prevents cross talk from other heart rate monitors; Smart transmission for long battery life; On-the-chest monitor provides continuous heart rate readings during even the most intense activities; Comfortable elastic strap; Replaceable batteries; Strap�Water resistant 30m; Strap will not provide accurate heart rates when underwater.). COLOR: Black and Silver.