C. Crane WR-2A - Manual (Page 22)

2
When the alarm sounds
When the buzzer alarm activates, the alarm will start softly and
gradually increase in level. It will sound for minute and silence
for minute in repetition for 60 minutes unless cancelled. When
the other alarm types are set, the radio will sound non-stop at the
selected time for up to 60 minutes.
When the radio alarm is activated, the alarm will go off in Humane
Waking System. It will increase its volume in 0.5increments from 0
to your set volume.
To deactivate a sounding alarm, press the Power button to cancel a
sounding alarm.
Disabling / cancelling alarm setting
To cancel the alarm setting, press and hold the corresponding
alarm button before the alarms sound off.