LuckyStone Digital Handheld Multi-Function Professional Electronic Chronograph Sports Stopwatch Timer Water-Proof Stop Watch, Display Great for Sports Coaches Fitness Coaches and Referees, Large Light weight and included lanyard this sports stopwatch is the ideal time measurement device for athletes - especially runners - coaches & referees Waterproof two stopwatch function time date display: Can be used in any weather condition Time, date and alarm function: Switch between 3 display modes to check the time, date and set your alarm Large display, material: Abs Built-in ag13 button battery