Active Stylus pen for smartphone and tablet pen tip material: Carbon fiber Stylus Pen Fine Point dimension:about 2mm. Stylsu pen tip twist to adjust sensitivity. stylus pen is good for drawing and writing. Applicable to more apple and android cellphone and tablet capacitive touch screens. Apple iOS and Android devices. Only switch on,without Bluetooth connecting or download software. .Idle for 3 minutes automatically shut down. The IC control sensitivity of stylus for different device with different capacitive screen. If you change the device, and it is not sensitive, just twist the pen point to control it. The carbon fiber stylus tip is robust when touching it by hands, however when comes to writing on screen, it has soft feel, it will not damage screen, feel safe to use it. If you change the device, and it is not sensitive, just rotate the pen nib to adjust it. It's fluent and accurate to writing or drawing pictures on tablet, click small icon on smartphone.