Google Nexus One User Manual page 291

Clock
Touch Time to set the time of the alarm.
4
In the dialog that opens, you change the time by touching the + or - buttons and
the AM or PM buttons. Or touch a time to type the time you want.
Touch Ringtone to select a ringtone for the alarm.
5
You can select a ringtone that comes with the phone or one that you saved as a
ringtone by using the Music application. See "To use a song as a ringtone" on
page 277.
The ringtone plays briefly when you select it.
Touch Vibrate to have the phone vibrate, in addition to playing the ringtone.
6
Touch Repeat to set the days when you want the alarm to sound.
7
If you don't set a repeat, the alarm sounds only one time.
Touch Label to enter a name for the alarm.
8
When you're finished, touch Done.
9
At the time you set, the alarm sounds.
10 Press Back
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to return to the main Clock screen.
291
Nexus One User's Guide