Bring your ideas to life with the lenovo active pen. This pen boasts pin-point accuracy, palm rejection technology and 2, 048 levels of pressure sensitivity to provide a natural pen and paper experience when you sketch and jot down notes. Powered by a single aaaa battery, the lenovo active pen also features two built-in side buttons for ease-of-access, a usb pen holder for storage and three replacement pen tips for longer use.2, 048 Levels of pressure sensitivity.