Optimum Time OS Series 15. ‘The OS Series 15’ is a water resistant watch which features time of day, calendar, alarm, count up (from zero) timer and a programmed countdown timer with alarm.
The countdown timer can be set to countdown to zero and count up again or to countdown to zero and then repeat the programmed period. Once the countdown timer is running the start/stop sync and mode buttons are the only ones that will have a function. At any time a button is pressed that is going to have any functions the alarm sounds a single beep.
- Countdown Repeat option or Countdown and Up to show elapsed time for handicap races
- 5,4,1,0 ISAF start sequence pre-programmed with audible warning signals (can be silenced if preferred)
- 5 minute and 3 minute pre-programmed options.
- User selectable 1 minute periods ideal for match racing.
- Sync Button. The famous Optimum Time invention to quickly get back to Race time if the gun is missed.
- Count-up from zero if required to time a match.
- Electro-luminescence backlight feature
- Grey reinforced durable ABS case
- Soft-touch silicon strap for maximum comfort
- Heavy-duty black plated stainless-steel buckle
- Large 39mm viewing area
- Round 29mm diameter display size
- Very Large 12.5mm digits
- Water Resistant to 5 ATM
- Shock Resistant Construction
- Normal Timekeeping Mode (12 or 24 hour)