Rich in quantity: 2 packs of simple stopwatches; You can see how to use the black stopwatch by looking at the fourth product display picture; Note: you can cancel hourly chime by pressing and hold reset, and press mode Multi-functional stop watch: the stop watch is simple to operate with 3 keys to control: split/reset, start/stop and mode; Large LCD display can display date, calendar,hour, minute, seconds and alarm clock, and it can be turned off Different models: the stopwatch timer provides 12 /24 hour system for you to choose; A/P means 12 hour mode, H means 24 hour mode; A means AM, P means PM Easy to use: light weight, lithium battery, included lanyard, which is easy to carry; Each stopwatch comes with a black lanyard that is tied at the end; You can take it with your hand or put it in your pocket, or stowed around the neck with the lanyard Suitable occasions: these digital timer watches are the ideal time measurement device for athletes, coaches and referees; Suitable for sports competition, swimming, running, training etc.; You also can use the sport stopwatch to time various tasks