A stylus pen that can be used as an input device to a digitizer associated with a computer screen on a computing device, such as a computer, mobile device, tablet, etc. The stylus pen can include an end cap that has multiple pressure thresholds for implementing different user-input commands. To detect the pressure being applied to the end cap, the cap is movable relative to a stylus pen body so as to move a plunger in proximity or contact with a mechanical switch. The mechanical switch is a single-action switch that is converted to a dual-action switch by using the electrical conductivity of the switch to detect an electrical coupling between a plunger and the switch. The electrical coupling can be in the form of a capacitive coupling or a direct electrical connection. Further pressure can be detected through actuation of the mechanical switch.