This light but durable aluminum pen features Acer Hover Access support, enabling you to access applications in three simple steps: 1. Hold or hover the pen slightly above the screen. 2. Double-click the lower button on the side of the pen. 3. Tap to launch apps to write notes, draw and edit. There?s almost no lag time between when you start writing or drawing and when you see it appear on the screen. The Acer Active Stylus Pen delivers precision accuracy and pressure sensitivity for drawing thick or thin lines. It?s Microsoft 10 certified and requires one AAAA battery (not included).