Not all stylus pens are Bluetooth. Some are passive, meaning they don't require any additional connection or power source. Active styluses, on the other hand, are often made of conductive materials like rubber or plastic and work by simulating the touch of a finger. They also often use Bluetooth technology to connect to your device. This allows for features like pressure sensitivity, tilt detection, and customizable buttons. These styluses usually require a battery or other power source.