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 FUNCTIONYS-810 stores 10 reminders for events. It can measure up to 10 hours in 1/100 second. YS-8100Allow you to record both lap and split times with the ability to save 100 memory slots for events. It can also measure up to 10 hours in 1/100 of a second. 2.MEMORY RECALL FUNCTION: YS-810 Up to 10 readings can be stored in memory. YS-8100 Up to 100 measurements can be stored in memory, and they can be recalled with fastest lap, slowest lap and average lap time, also can recall each split time/lap time in order. 3.THREE ROWS DIGITAL DISPLAY LARGE SCREEN Lap time, split time and total ride time are displayed on the same screen with three separate lines. It is suitable for sports coaches to easily display the time and recording date. 4.MULTIFUNCTION STOPWATCHStopwatch with countdown timer, calendar clock and alarm clock allows you to better manage time in sports and daily life. 5.COUNTDOWN TIMERThe stopwatch is equipped with the countdown function and can be used as a countdown timer. Press "MODE" button to enter countdown timer mode. The "TR" will appear on the screen. When the countdown time is up, the alarm will sound.