Robic SC-500E Single Event Stopwatch, Black Easiest to Use stopwatch ever made-Perfect for those many activities where only basic timing is required. The SC-500E can be used error-free, by anyone, for accurate results One-step timing for all events Start/stop/reset operation 1/100 second resolution to 10 hours--Ideal for finish line volunteers or lane monitor timing Audible beep confirmation or silent operation--Ideal for volunteers; Eliminates timing errors Water Resistant to 30 meters Break-Away Safety Lanyard helps prevent accidents, promotes safe use One year factory warranty; Lithium battery CR-2032 The easiest to use stopwatch ever made error free