Optimum Time OS12


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The OS12 encompasses style and substance, perfect for those wanting a sophisticated look without sacrificing functionality. The display changes to large 19mm digits in the final minute, ensuring top visibility when it really counts. The OS12 also features our essential sync button, which synchronises your countdown to the race control timer, ensuring you won’t miss the gun. The OS12R includes a rechargeable battery with a USB cable.


  • Black ABS case
  • Removable soft silicone strap
  • Polished stainless-steel buckle
  • 39mm viewing area
  • 28mm diameter display size
  • 3-row display with 9mm digit display
  • 19mm digits for the final 59 seconds
  • Water-resistant to 5 ATM
  • Shock-resistant construction
  • USB rechargeable battery (USB cable supplied)
  • Electro-luminescent backlight feature


  • Normal timekeeping mode (12 or 24 Hours)
  • Pre-programmed 5,4,1,0 ISAF start sequences or 5 min, 3 min, and 1 min programs with audible alarms (can be silenced if preferred)
  • Countdown & repeat or countdown and up
  • Sync button for instant synchronisation if a gun is missed
  • Count-up from zero