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Cheering in the crowd, waiting at airport arrivals, standing outside a shop — type a message, tap [Start], and it scrolls across your whole phone screen like an LED sign. "Display lock" is on from the start, so a stray touch in a crowd won't close it. To exit, press and hold the screen. ■ Change it while it's showing · Tap the banner once while it's showing, and color and speed buttons appear at the bottom (just color when the motion is Still). "Edit text" takes you back to change only the message. · While it's showing, the screen stays on at full brightness. Both go back to normal when you exit. · After you tap [Start], turn your phone sideways for a bigger landscape view. You can also lock the screen to landscape or portrait. ■ Set it all on one panel · The "Display" panel on the first screen holds lines, screen direction, motion, text size, blink and speed side by side. The preview at the top shows your changes as you make them. · Five motions: Still, Left, Right, Up and Down. When the text fills the screen, it tells you "Full". · Show it on several lines (3 on iPhone, 4 on iPad). · Pick a message from the Cheer, Airport pickup, Birthday, Taxi and Shop chips and it goes straight into the text box. "Undo" brings back what you had typed. ■ Style · Tap any of the four tiles in "Style" on the first screen (Font, Color, LED dots, Effect) to jump straight to that spot on the style screen. · Free: 9 text colors · 5 board colors · 4 fonts (Basic, Pixel, Do Hyeon, Jua) · round LED dots · line splitting · emoji · Decoration Pack (paid · one-time purchase): 6 fonts (Black Han Sans, Handwriting, Heavy Gothic, Mulmaru, Dongle, Old Film) · add your own fonts (.ttf, .otf files) · small, big and square LED dots · neon and rainbow effects · Tap locked items to try them in the preview first. If you tap [Start] while trying them, you choose between getting the Decoration Pack and showing it with the free styles. · At the top of the Decoration Pack screen, a small LED sign scrolls in the pack's styles (Black Han Sans, square dots, rainbow). ■ Saved messages · Save a message with its color, speed, size and direction, and show it again in one tap. 1 slot is free; add 3 or 10 slots with a one-time purchase. ■ Your messages aren't sent anywhere · The LED sign doesn't use the network, and your messages are never sent anywhere. Messages and settings may be included in your phone's device backup. · Choose the app language from Korean, English, Japanese, German, Spanish and Traditional Chinese. Light and dark mode both work. No ads, no subscription — every purchase is one-time. No permission pop-ups, and Modoo ID sign-in is optional; everything works without it.