Apple iPhone 4G - Manual (Page 153)

Stopwatch
Use the stopwatch to time an event:
1 Tap Stopwatch.
2 Tap Start to start the stopwatch.
 To record lap times, tap Lap after each lap.
 To pause the stopwatch, tap Stop. Tap Start to resume.
 To reset the stopwatch, tap Reset when the stopwatch is paused.
If you start the stopwatch and switch to another app, the stopwatch keeps running.
Timer
Set the timer: Tap Timer, then flick to set the number of hours and minutes. Tap Start
to start the timer.
Choose the sound: Tap When Timer Ends.
Set a sleep timer: Set the timer, then tap When Timer Ends and choose Sleep iPod.
When you set a sleep timer, iPhone stops playing music or video when the timer ends.
If you start the timer and then switch to another iPhone app, the timer keeps running.
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