KALIDI Digitizer Stylus Surface Pen for Microsoft Surface 3 and Surface Pro 3/ Surface Pro 4 100% Brand New and made of high quality and durable material Compatible with Surface 3, Surface Pro 3,Surface Pro 4 and Surface Book Easy to oparate and convenient:put battery into the pen ,then use it directly. Palm Block technology ignores the pressure from your hand when it senses you're using pen With over 384 levels of pressure sensitivity, Surface Pen lets you draw and paint with artistic precision. The erase button and the right-click button on the side of Pen