NEC M350X User Manual page 114

Loosen the screw securing the port cover.
port.
Remove the cap from the USB Wireless LAN Unit, and then insert
it with the surface (side of indicator) facing outward. Keep the cap
for later use.
Insert the catch of the USB (LAN) port cover into the groove of the
projector cabinet, and then tighten the screw to secure the port
cover.
6. Installation and Connections
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