Acer PD721 User Manual page 20

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User Controls
5.> Press " " to save and exit the "User's info." menu.
6.> The startup screen will display the new wording after restart the
projector.
Note:
Each line can input 35 characters only.
Once entering "User's info." menu can use remote control to
operate only.
Use "Del" to delete the previous character.
Use "Space" to add a space.