... and free maintenance service for 3 yearsModle Nameauto metal mini air compressorMaterialMetal(aluminum, alloy or stainless steel)Rated Power220WVoltageDC 12VCurrent18AFlow50L/ ... barometer pointer will increase, when the pointer reaches an appropriate air pressure, press the off switch , remove the power line ... means all the work finished and inflating successly. mini car air inflator pump (New Model)