Product Description Material: ABS Size: 75*62*21mm Color: White, Army Green Battery: CR2032 button battery (included) Quantity: 1 piece Package Contents: 1 * Training Running Watch 1. [Lap and Split Measurement Function]: YS-810 stores 10 event reminders. It can measure up to 10 hours in 1/100 second. YS-8100 allows recording of lap and split times and is able to save 100 event storage locations. It can also measure up to 10 hours in 1/100 second. 2. [Memory Recall Function]: Up to 10 readings can be stored in the memory of YS-810. Up to 100 measurements can be stored in the memory of YS-8100, which can be called up by fastest lap, slowest lap and average lap time, or each split time/lap time can be called up in sequence. 3. [Three-row] Digital large screen display]: Lap time, split time and total driving time are displayed in three rows on the same screen. Suitable for sports coaches to easily display time and shooting date. 4. [Multi-function stopwatch]: The stopwatch with countdown timer, calendar clock and alarm allows you to better manage time in sports and daily life. 5. [Countdown]: The stopwatch has a countdown function and can be used as a countdown timer. Press the "MODE" button to enter the countdown mode. "TR" will appear on the screen. When the countdown time is up, the alarm will sound.