Sangean WR-22 (V1) - Manual (Page 39)

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Software version
The software display cannot be altered and is just for your
reference.
. Press and hold the Info/menu button to enter the menu setting.
2. Rotate the Tuning control rotary until “P XX” appears on the
display to view the software version of your radio.
RESET the radio
If your radio fails to operate correctly or some digits on the display
are missing or incomplete, please carry out the following procedure.
. Switch off the radio.
2. With the aid of a suitable implement (e.g. paper clip), press the
RESET button located in the bottom of your radio for at least 2
seconds. This will reset the microprocessor clock time and clear
all stations stored in the preset memory.
Subwoofer out socket
Connect the subwoofer input with built-in amplifier. Subwoofer
output level will change in accordance to the volume adjustment of
the radio.