Robic SC-500E Single Event Stopwatch The Robic SC-500E Single Event Stopwatch offers one-step timing for all events. Ideal for finish line volunteers or lane monitor timing. Start /stop/reset operation, 1/100 second resolution to 10 hours. Audible beep confirmation or silent operation. Break-away safety lanyard helps prevent accidents and promotes safe use.Water resistant to 30 meters. Lithium battery CR-2032 included.