NEC NP40 - Manual (Page 51)

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Enabling Security [Security]
This feature turns on or off the Security function.
Unless the correct keyword is entered, the projector cannot project an image. (
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Selecting Menu Color [Menu Color Select]
You can choose between two color modes for menu color: color and monochrome.
Selecting Menu Display Time [Menu Display Time]
This option allows you to select how long the projector waits after the last touch of a button to turn off the menu.
The preset choices are “Manual”, “Auto 5 sec”, “Auto 15 sec”, and “Auto 45 sec”.
Selecting a Color for Background [Background]
Use this feature to display a blue/black screen when no signal is available.
5. Using On-Screen Menu