# Input Methods and Usage Techniques

1. **Letter area**, long press on a single letter to switch between uppercase and lowercase of the current letter and the corresponding symbols.
2. **Case switch,** to the left of the 【Z】 key is the case switch, long press to fix the uppercase or lowercase environment.
3. **Delete**, to the right of the 【M】 key is the delete key.

   In the 9-key state, below the 【Delete】 key is the 【Clear】 key, which will clear all input contents.
4. **Symbols**, the lower-left corner button is the symbol key, click to open the symbol input page.
5. **Numbers**, to the left of 【,】 is the number key, click to open the number input page.
6. **Switch input,** 【🌐】 is the language switch button, click to switch to different languages, long press to display language prompts.