Mitsubishi Endeavor Owner's Manual page 191

Features and controls
3. Press the "START" function button to start the timer. To
stop the timer before it has reached 0:00:00, press the
"STOP" function button.
3
NOTE
If the timer reaches 0:00:00 while another display is
showing, a tone sounds once and the display changes to
the countdown timer for seven seconds.
If the "DISP" function button is pressed at this time, the
countdown timer disappears and the previous display
appears again.
When the countdown timer has started, the "START"
function button becomes the "STOP" function button.
Even if the ignition switch is turned to the "OFF" position
while the countdown timer is running, the countdown
timer continues counting down to 0:00:00.
3-102
Normally, a tone sounds to indicate that the countdown
timer has reached 0:00:00. It is possible to make a setting
so that the tone does not sound at this time. For details,
refer to "Timer buzzer setting" on page 3-126.
4. To reset the countdown timer, press the "SET" function
button for at least 2 seconds. The display will return to
0:00:00.
NOTE
Even if the "SET" function button is pressed while the
countdown timer is running, the countdown timer will not
be reset.
If the "SET" function button is pressed lightly one time,
the previously set timer duration will be shown. To
change the timer duration setting, perform the procedure
again from step 1.