LCD Writing tablet: Energy saving battery, screen lock, stylus pen, and one-click clear product description: funblast lcd writing tablet with cr2025 anti-accidental deletion detailed features of (battery, erase function).

Button Battery: The board is powered by a CR2025 3V button cell battery, which is designed to be energy efficient.

Screen Lock: There's a physical switch or slider mechanism that can lock the screen

One-Touch Erase Button: As seen on the of the LCD board in the image, there is likely a button to clear the entire screen with a single press.

Stylus/Pen Included: A dedicated stylus is provided pen for writing and drawing on the board.