【Silent Working Condition】 - This referee stopwatch operates mute during normal use time, giving you a quiet environment when using Sports Stopwatch Can display minutes, seconds. Measure time to an accuracy of one hundredth of a second 【Stainless Steel Referee Whistle with Lanyard】 - Sports Stopwatch WatchThe high quality stainless steel material whistle features a crisp sound. And with a detachable yellow lanyard, you can release them, which is essential for racing, training and other sports 【Multifunctional Timer Stopwatch】 - Whistle and Stopwatch Lightweight, meets the requirements of most situations. Serve as stopwatch, clock, chronograph and alarm. Apply to many sports. Football, basketball, running, fitness, swimming, baseball, wrestling, taekwondo, etc. Suitable for athletes, track and field, runners, etc. It can meet the normal use requirements. The package includes a stainless steel referee whistle, essential for sports. This product combination can fit almost everything you need! Multifunctional Sports Stopwatch Large screen, it also has large display numbers. Small, lightweight, easy to carry, one hand can control. Include a lanyard, whether hanging on the body or holding by hand is very convenient. Normal time of day, day in hours, minutes and seconds, calendar with date, month and date, can replace your phone or watch that displays the time. stopwatch also have 12/24 hour time options. Food grade stainless steel whistle Suitable for teachers, self-defense, survival, emergency, animal husbandry, bird or dog training, etc. Whistle with yellow lanyard to keep your hands free. You can carry it easily and conveniently. Stopwatch Settings Use! In the normal time display, press the MODE key, you will see the entry into the stopwatch state, then press the START key (right) to start timing, you need to press the START button again, and then continue to press the START button. W Once the stopwatch is stopped, press the SPLIT button (left) to return to zero. How to turn on/off hourly alarms? 1. Press and hold the left button (SPLIT/RESET button) 2. Press the right button while holding down the left button (START/STOP button) The hourly alert feature is turned on! 2. Press and hold the left button (SPLIT/RESET button) 3. Press the right button while holding down the left button (START/STOP button)