NEC MultiSync P402 User Manual page 11

Internal/External speaker switch
Switch to turn internal speaker/external speaker.
: Internal speaker : External speaker.
NOTE: Please power off the monitor when you use the
Internal/External speaker switch.
Kensington Lock
For security and theft prevention.
Option board slot
Slot 1 and slot 2 type accessories are available. Please
contact your supplier for detailed information.
NOTE: Please contact your supplier for available option
board.
NOTE: When you use slot 2 type option board, you need to
install it with the optional "SB-02AM" adapter.
Internal speaker
* BNC input signal
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