Key FeaturesPressure-Sensitive Screen: Uses a liquid crystal display that responds to the pressure of a stylus or even a fingernail to create lines.One-Key Erase: Features a dedicated button (often a trash can icon) that instantly clears the entire screen by sending a small electrical pulse through the liquid crystal layer.Lock Function: Includes a switch (usually on the back or side) to "lock" the screen, preventing your drawings or notes from being accidentally erased.Long Battery Life: Typically powered by a single replaceable 3V coin cell battery (such as a CR2016 or CR2025), which can last for thousands of erasures.