Nokia 2135 - Manual (Page 42)

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Countdown timer
You can enter a specified time up to 99 hours, 59 minutes.
The timer starts to count down. When the timer reaches zero,
an alarm sounds.
The countdown timer only works when the phone is on.
When you turn off your phone, the timer is no longer active.
To set the countdown timer, select Menu > Organizer >
Countdown timer. Enter the time, and select OK. Enter a
note for the timer, and select OK (in hh:mm).
Appears in the standby mode when the countdown
timer is set.
When the time runs out, your phone sounds an alarm,
displays a timer note, and flashes its lights.
Select Menu > Organizer > Countdown timer > Change
time to change the time and Stop timer to stop the timer
before the alarm sounds.
Stopwatch
Your phone has a stopwatch that can be used to track time.
The stopwatch displays time in hours, minutes, seconds,
and fractions of a second in hh:mm:ss.ss format.