Optimum Times latest timer is durable and easy to wear but packs all the functionality of our jumbo models. The super soft silicone strap keeps the mid-size display at just the angle you need. With a reinforced plastic case and stainless-steel buckle, this watch is made to last. The OS15 also features our essential sync button, which synchronises your countdown to the race control timer, ensuring you won’t miss the gun. Features • 29mm diameter display size • 39mm viewing area • 12.5mm digit height • Reinforced plastic case • Soft-touch silicone strap • Black-plated stainless-steel buckle • Water resistant to 5 ATM • Shock resistant construction • Electro-luminescent backlight feature Timer Functions • Normal timekeeping mode (12 or 24 hours) • Countdown & repeat or countdown and up • Pre-programmed 5,4,1,0 ISAF start sequences, or 5 min, 3 min and 1 min programs with audible warning signals (can be silenced if preferred) • Sync button for instant synchronisation if a gun is missed • Count-up from zero