Heat Stress Stopwatch, Accuracy +/-1.8 Degrees F 32 to 104 Degrees F, Features 10 hours Countdown Timer with Audible Beeper, 48 In. Nylon Lanyard, Average Lap Recall, Backlit LCD Display, Calendar Mode, Lap Counter, Programmable Alarm, Silent Operation Option, Stopwatch Chronograph, Count Direction Count Down, Count Up, Digital Display Screen Type LCD with Backlight, Maximum Time Capacity 9 hours, 59 minutes, 59 seconds, Alarm Type Audible, Visual, Resistance Properties Water