Reduces or eliminates unexpected movement of the pointer caused by moisture or humidity on the trackpad of the Macintosh PowerBook 190, Macintosh PowerBook 1400, and Macintosh PowerBook Duo 2300. Use it if you notice the pointer moving abruptly when you initially touch the trackpad or "jumping" to its previous position when you lift your finger after moving the pointer or tapping the trackpad. Do not use if you have not had pointer-movement problems on your computer. (The extension could make the pointer less responsive when you use the trackpad.)
