Fully Automatic Nitrogen Tire Inflator WDF-X730 Feature: N2 inflation for car or mini-bus; Fully automatic; Inflate 2 tires at the same time; Customized setting the tires pressure, beep when inflation completed; Prompting message for low inlet pressure or leakage; Tertiary air filter to keep out the impurities; 40LN2 storage tank built-in; Unit reading changed among KPA, PSI, KG&BAR; Nitrogen purity:95%-99%. Specification: Nitrogen purity 95%-99% Internal Tank 40L or 60L