This is an on-the-go smart capacitive stylus that is compatible with ipad and Android. There is no need to pair, just turn on the power switch button and you can use it with your favorite application. The combination of square and round shape and fine stripe mechanism is not only novel in design elements, but also plays an anti-skid role. The pen cap can be compatible with other brand designs, which can reduce production costs and make its products more competitive in the market. It can replace the pen tip design and ensure lasting functionality. It can also extend the service life of the smart pen.