Sangean PR-D18 (V1) - Manual (Page 15)

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Turning off the sounding alarm
Press the Power button to turn off the sounding alarm, otherwise,
the alarm will sound for an hour.
Cancelling the alarm setting
Press and hold the Alarm button until you hear a beep and the alarm
symbol will disappear on the display.
Sleep timer
Your radio can be set to turn off automatically after a preset time has
elapsed. The Sleep Timer setting can be adjusted between 5,30,
45, 60, 90 and 20 minutes.
. Press and hold the Power / Sleep timer button until you hear a
beep and the symbol of shows on the display.
2. Holding the Power / Sleep timer button down will cycle through the
times of 20, 90, 60, 45, 30 and 5 minutes.
3. Release the button when the desired sleep timer option appears
on the display. Now the symbol will appear on the display. The
radio will shut off after a preset time has elapsed.
Note:
To deactivate the sleep timer, simply press and release the Power
button.