• Press the MODE button until the stopwatch display, if the stopwatch display is not zero, press the STOP button to stop timing, press the REST button to reset to zero
• Press the STOP button to start timing, then press the STOP button to stop the timing (press the STOP button repeatedly, repeat the start/stop), press the REST button to reset to zero
• Split timing: Press the STOP button to start timing, press the REST button to display the first period; press the STOR button to stop timing, press the REST button to display the second period of time, and then press the REST button to reset to zero
• Time, calendar, and alarm display: Press the MODE button until the normal travel time is displayed, press the STOP button to display the month, day and week; press the REST button to display the alarm time; press the REST button and the STOP button at the same time to cancel/maintain the alarm

Specification: 

• Item No.: ZSD-013
• Material: plastic
• Size: 79*62*18mm
• Waterproof: no
• Power supply: button battery(included)
• Display row number: single row
• Number of test channels: two
• Display accuracy: 0.01 seconds