Casio W71-1V Black Casual Classic Watch - 50M Water Resistant 
Features: 

50 Meter Water Resistant 
Micro-light 
Dual time 
1/100 second stopwatch 
Measuring capacity: 23:59'59.99" 
Measuring mode: net time, split time 
1st-2nd place times 
Countdown alarm 
Input range: 1 second to 24 hours 
Measuring unit: 1 second 
Auto-repeat function 
Multi-function alarm (day, date) 
Hourly time signal 
Auto-calendar (pre-programmed until the year 2029) 
Accuracy: ± 15 seconds per month 
Battery: Approx. 5 years on CR2016