OS Series Sailing watch, model: OS1523, grey. Features: Reinforced durable ABS case, Soft-touch silicon strap for maximum comfort, Heavy-duty black plated stainless-steel buckle, Large 39 mm viewing area, Round 29 mm diameter display size, Very Large 12.5 mm digits, Water Resistant to 5 ATM, Shock Resistant Construction, Normal Timekeeping Mode (12 or 24 hour). Specialist Sailing Timer Functions: 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.