Features:<br> 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.<br> 3. Time and calendar function: display year, month, day, hour, minute, second, week, 12/24 hour system optional.<br> 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,<br> 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.<br> 6. Countdown function: It can set the countdown function and times counting function. The longest countdown time is 9 hours, 59 minutes and 59 seconds.<br> 7. Daily alarm clock function: can quickly turn on/off the alarm clock.<br> 8. Metronome function: beat frequency can be selected 5 times/minute- 320 times/minute (multiple of 5 times) and has times counting function<br> Specifications:<br> Model: YS810/ YS830/ YS860/ YS8100<br> Color: white/ black<br> Display: 3 rows display of 10/30/60/100 tracks<br> Material: ABS plastic shell<br> Battery: built-in CR2032 button battery<br> Display size: 35 x 23.5mm/1.38 x 0.93"<br> Product size: 75 x 62 x 21mm/2.95 x 2.44 x 0.83"<br> Gross weight: 70g