Sangean DDR-33+ (V1) - Manual (Page 28)

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Sleep function
Your radio can be set to turn off after a preset time has elapsed.
The sleep setting can be adjusted between 5 and 90 minutes in
5 minute increments. Ensure your radio is switched On.
1. When using your radio, press the Sleep button. “SLEEP” appears on
the display.
2. Repeatedly press the Sleep button to select desired sleep time.
The sleep setting will increase in 5 minute increments from 5 minutes
up to 90 minutes. A further press will cause the sleep timer to be set
to OFF which will cancel the sleep function.
3. The display will show the sleep timer setting then exit the
sleep options. The sleep symbol will show on the display.
4. Your radio will switch off after the preset sleep time has elapsed.
5. To cancel the sleep timer and switch off your radio before the chosen
sleep time has elapsed, press the On / Standby button.
To cancel the sleep timer without switching off your radio,
repeatedly press the Sleep button until “OFF” is displayed.