Microstructure for fluids provided in a rotatable disc having a U-shaped volume-defining structure connected at its base to an inlet arm of a U-shaped chamber. The work function of the electrode can be modulated by doping the metallic compound with dopants including nitrogen, silicon or germanium. Therefore, a sense of force based on the sliding is fed back to the operation knob. The content may include content that is currently available and bookmarks for content that is not yet available. The launching of the tire deflation device is triggered by a wireless remote system, otherwise known as the wireless trigger mechanism. After the abnormality detecting procedure is ended, the ECU sends a control signal having a predetermined frequency to the canister valve, thereby gradually increasing the opening size of the canister valve.