Shop Nilight Tire Inflator Air Compressor Portable Air Pump for 12V DC Car Tires with Digital Pressure Gauge 150PSI Auto Tire Pump with LED Light for Cars ATVs Bicycles in high quality, support 2 Years Warranty. Start car ignition, connect car plug to the 12V DC power outlet, set the desired value, and wait for the LCD display to stop blinking. Flip switch to on position, the air compressor will stop automatically when the preset value is reached. A great solution for emergency on the way.