1. Shutdown function: power can be turned off and the clock does not need to be reset (most stopwatches on the market currently do not have a shutdown function). 2. Key mute function: It can be muted and used under quiet situations. 3. Time and calendar function: display year, month, day, hour, minute, second, week, 12/24 hour system optional. 4. Stopwatch function: 3 rows display, segmented memory storage, precise value up to 1/100 seconds, the longest time is 9 hours 59 minutes 59 seconds, 5. The fastest, slowest, and average value can be viewed. When searching memory data, you can check up and down. Each function is easy to use. Professional Handheld Digital Stopwatch Chronograph Sports Training Timer Stop Watch. Countdown function: It can set the countdown function and times counting function. The longest countdown time is 9 hours, 59 minutes and 59 seconds. Daily alarm clock function: can quickly turn on/off the alarm clock. Metronome function: beat frequency can be selected 5 times/minute - 320 times/minute (multiple of 5 times) and has times counting function. Colour:Black/White Material:Plastic Package Contents: 1 * Stopwatch(with CR2032 button battery) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.