Powerology smart universal stylus pen has two modes: universal and palm rejection. It is made of an aluminum alloy. It provides smooth and lag-free performance for a long period of time. Its slim body and light weight make it easy to use. Wide compatibility is a fact of universal usage.Tap the Powerology universal stylus pen cap, greenlight enables palm-rejection mode. Palm rejections mean when the pen is connected to the iPad, it only recognizes the Pen tip and not your finger, allowing you to write or sketch. Palm rejection allows you to comfortably rest your palm on the iPad screen while using this stylus pen. Without this function, your hand would create unwanted markings on the sheet that you work on.