In an antiskid brake control system, an ECU estimates a wheel slip in accordance with a sensed wheel speed and controls a fluid pressure control valve for braking operation in accordance with the estimated wheel slip for an antiskid brake control, the fluid pressure being reduced when the wheel slip is enlarged and being increased when the wheel slip is lowered. One signal path generates an audio signal in response to incoming radio signals. The power stage receives a first output of the power system and provides a first signal. The microsystem is configured to communicate information regarding the at least one environmental condition and the movement wirelessly.