There are 3 models of pressure pen, the first one is loaded with battery, and the later one is charged. The latest one is G3 passive wireless version, which means that there is no battery and no charge. This technology is advanced. The pressure pen with battery and charge has only one button, which is brush and eraser switch key However, the buttons can be set through the driver panel, the specific function depends on the driver, and the passive wireless version of the pressure pen has two buttons, the specific function is similar to the first two, but two keys are much more convenient to use than one can set the key function through the driver, and some friend-based pressure pens are universal on different drawing boards That is to say, G3 can use other models of pressure pen, but the ordinary version of the drawing board can not use wireless passive pressure pen