SCGK Professional Handheld Countdown Timer Sports Stopwatch with Memory(30) 3 Line Display Digital, Timer Alarm Clock Pacer Water Resistant for Coaches,Referee,Runners and Athletes Able to display hour, minute, second, year, month, day, week Able to set the Alarm 12-hour or 24-hour time display STOP mode--Able to close the program to save power. SR44 batteries (silver oxide) Water-resistance, shock-proof, slid-proof structure Can preset countdown timing and count up to 10 hours Automatic cycling timing and time display 30 seconds suspending countdown timing 1/100 decimal second is the minimum unit Split time, total time and lap time can be displayed Able to measure 9 hours, 59 min memory and 59.999 seconds It can scroll back and forth when to read out the memory digits Able to display the fastest, slowest or the average split time and corresponding rows Memory: 30 the last data can be read out from memory after resetting. Able to record the split times(00-199) Step 1:Press the D key to switch between 2 and 3 times,display &#034;PRCE OF-10&#034; Step 2: Continue to hold down the C key for more than 3 seconds,until you see &#034;all-off&#034;character,then release the C button Step 3: Press the A button for one time to turn off the display measure lap times stop your time while running measure time between sets in the gym stop smoking by measuring non-smoking streaks 1 x stopwatch 1 x stopwatch necklace 1 x user manual