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The PMP3520 has a Lock Switch to avoid accidental operation. Slide the Lock
Switch to lock position while power is on. If any control button is pressed the
“Locked!” message displays to indicate all function keys are disabled.
If the PMP3520’s power is Off, and the lock-switch is in the lock position, the
unit will not turn on.
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The PMP3520 has an SD/MMC slot. You can insert a Secure Digital Card or
MultiMedia Card into the slot to allow your photos, videos, or music to be played
or displayed on the PMP3520.
SD/MMC slot
Lock Switch