Slime's Air Compressor is easy to use. It features a dial gauge measuring up to 300 PSI, and a powerful light for optimal visibility in a range of conditions. Independent on/off switches for both the light and compressor increase the unit's versatility, and it is powered by the car's 12-volt cigarette lighter. Slime's 300 PSI Air Compressor helps maintain optimal tire inflation, which minimizes tread wear, increases gas mileage and improves handling, fuel consumption and maintenance.