If you are a coach or referee and need professional stopwatches. Please choose our Digital Sport Stopwatch Timers. 12/24 Hour Alarm Calendar Multifunctional 1/100 Stopwatches Electronic Digital Stopwatch with Lanyard, Sport Chronograph for Coach Referee Teacher, Suitable for Gym Running Swimming Fitness Football Basketball. More Features: High-quality stopwatches and whistles, safe and durable, simple and practical; meet the daily needs of sports coaches, referees, athletes, football players, and runners. 1/100 multifunction timer stopwatch with 12/24 hour system, calendar, alarm clock. The timing is accurate to 0.01, and the second is clear and easy to read. You can easily set the time according to the instructions on the stopwatch package. This stopwatch is the perfect for any physical education teacher or coach. Specifications: Material: ABS Plastic & Stainless Steel Color: Black Quantity: 2 pieces stopwatches Stopwatch Size: 7.5 * 6.2 * 2 cm / 2.95 * 2.44 * 0.79 inch Stopwatch Rope Length: approx. 50 cm / 19.68 inch Powered By: AG13 Button Battery (Included) Weight: 100g Attention: 1. This sports stopwatch will keep working after setting the time and cannot be turned off. 2. The battery can be used for one year. When replacing the battery, you need to use a tool to open the back cover. Package Includes: 2 x Digital Stopwatch Timers