The Promethean ACTIVPEN3-10 ActivPens 10 pack unique battery-free, wire-free pen writes like a pen yet acts like a mouse. The ActivPen can drag-and-drop, highlight, open tools and applications, switch between pages and activate sounds and images. The full mouse functionality allows you to interact with computer based applications or websites from your ActivBoard. The ActivPen is so accurate and precise, you can measure and mark on-screen to the millimeter or degree. Because the ActivPen uses no batteries it is both very cost effective and virtually maintenance free.