OSD Menu15OSD Language: Allows you to select menu language.5. OPTION menuSee [Basic Operation] for using the menu system.OSD MenuTT Language: Seclet the Teletext language.Software Update(USB): Press OK button to enter the software update menu.Hotel Mode: See next page.Aspect Ratio: Choose from 4:3, 16:9, Zoom1, Zoom2 and Panorama.Blue Screen: Turn on/off the blue screen function when there’s no signal.Key Lock: Turn on the function, and the buttons on the TV will be invalid.Reset: Press OK button to restore factory default.