Sangean DPR-45 (V1) - Manual (Page 31)

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Key lock function
The key lock function is used to prevent unintentional operation of the radio.
1. Key lock switch is located on the panel on the right hand side of the radio. When the key lock
switch is set to LOCK, every button will be disabled. Display will show “Lock”
. To disable the key lock function switch the key lock button to off position. The key lock function
will be disabled.