Sun Telecom AN1000 User Manual page 16

Press Function button 3 times until "SET ALARM?" is
displayed on the screen.
Press Read button on "SET ALARM?" indicator to
select an Alarm setting mode.
To choose and set desired condition, press Read button to
toggle (Ex. YES NO).
To move to each field (hour, minute, am/pm), press the
Function button.
Press the Read and Function buttons simultaneously to
return to the main screen.