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The Proline manual (comes on a CD with the player) says:
6.3.7 Key lock
This function sets a time delay from when key lock function is started or the player is switched on, after which the player will automatically stop responding to the control buttons. Pressing any button will then display the message ‘Locked’. Key lock is useful, for example if you put the player in your pocket and don’t want any buttons to be pressed accidentally. The time delay is to let you start playing the music and so on. You can choose a delay of ten or thirty seconds, one, three or ten minutes, or you can disable key lock completely. •
Press and hold the V+ button for a couple of seconds to temporarily unlock the keys.