TP in G 1 refers to "handwriting pen", which is the input device of electronic equipment. The stylus can interact with the touch screen of the device, and users can operate on the screen through the stylus, such as writing, drawing and selecting. Handwriting pens usually have pressure sensing technology, which can make different responses according to the user's pressure on the pen. Handwriting pen can improve the interactivity and accuracy of electronic equipment, and is suitable for applications involving graphic design, creation, signature and other fields.