Display number of rows: single row Number of test tracks: two Display accuracy: 0. 01 seconds. First, the stopwatch timing Press the MODE key until the STOPwatch shows. If the stopwatch shows non-zero, press the stop key to stop timing, and press the REST key to reset to zero. 1. Stopwatch timing Press the STOP key to start timing, then press the STOP key to STOP timing (repeatedly press the stop key to repeat start/stop), and press the REST key to reset to zero. 2. Step by step timing Press the STOP key to start timing, and press the REST key to display the first period of time; Press STOR to stop timing, press REST to display the second period of time, and then press REST to reset to zero. Second, the time, calendar, alarm display Press the MODE key until the normal walking time is displayed, and press the STOP key to display the month, day and week; Press the REST key to display the alarm time; Press and hold the REST key and the STOP key at the same time to sound cancel/hold. Third, set the time and calendar Press the MODE key for 3 times in the normal walking state, and the second flashes when walking normally, thus entering the time setting MODE. Press the STOP key to set the number (hold it still and set the number quickly), and press the REST key to select the second, minute, hour, day, month, week and A/P (12-hour system, A for morning, P for afternoon and H for 24-hour system) as the calibration objects, and the calibration is finished. Fourth, set the alarm Press the MODE key twice in normal walking state, and the hour and week will flash at the same time, thus entering the alarm setting mode; Press REST to select minutes and hours, press STOP to change the numbers of minutes and hours, and press MODE to return to the time display; In the normal walking state, hold down the REST key and press the STOP key at the same time, and the alarm symbol will appear/disappear, while the alarm will remain/cancel; Press the MODE key at the same time, the hourly report symbol (seven characters from Sunday to Saturday) appears/disappears, and the hourly report remains/cancels. V. Battery replacement When the display is dim or there is no display, open the back cover, install the same size battery, and then install the back cover.