Sangean DT-300 - Manual (Page 16)

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Mono/Stereo Button
Monaural or Stereo headphone reception may be selected durning FM
reception by alternately pressing the Mono/Stereo Button The Speaker
On/OffSwitch must be in the Off
Lock Switch
To Prevent accidental changing of any of the radio settings move the Look
Switch to the locked position. When engaged in the locked position
the icon key will appear in the LCD display. To release the lock switch
simply move the switch to the off position. Make sure lock Switch is in
off position when radio is to be used as radio is completely inoperative
until lock switch is released. If the radio is not to be used for any extended
period of time,battery power saving may be relized by setting lock switch
in its locked position during storage.
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