Sangean DT-120 (R3) - Manual (Page 9)

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Key Lock Function
The key lock function is used to prevent unintentional
operation of the radio. Key lock switch is located
on the rear of the radio. When the key lock is set
to LOCK, every button will be disabled and a key
lock icon will appear on the screen. To disable the
key lock function, switch the key lock button to off
position. The key lock function will be disabled.
Reset the radio
If your radio fails to operate correctly or some digits
on the display are missing or incomplete, reset
the product as described below to resume normal
operation. The system reset can be carried out while
the unit is powered off.
1. Make sure your radio is switched off.
2. Press and hold the Mono/Stereo button first, then
press and hold the Power button right after. Please
hold down these two buttons jointly until all the
icons shows on the display. Now all configuration
settings will be stored to their defaults, preset
stations will be erased and the clock will be reset.