A semiconductor device includes electrostatic protection circuit Q formed by connecting first NMOS transistor Q1 having first threshold voltage and second NMOS transistor Q2 having second threshold voltage lower than the first threshold voltage in parallel between power supply terminal N1 and ground terminal N2. The pneumatic windshield clearing system includes an air source assembly coupled vehicle, a blower assembly for directing high pressure airflow towards the windshield of the vehicle, and a suction assembly for removing rain, snow, and other debris for m the windshield. A power source is supported by the vest and connected to the EL lamp strips to supply electrical energy to the strips so that they emit EL light, wherein the EL light emitted by the EL strip is a safety yellow color, and wherein other portions of the vest are a safety orange color.