This is a great switch for miniative air compressorIt can help to save electric energy of the air compressorEasy to install and convenient to useThere is a red ON/OFF switch knobAuto control. Auto load/unloadFour female air inlet ports with approx. 0.4 inch / 11 mm thread diameterMaximum Voltage: 240VCurrent: 16AMaximum Pressure: 90-120 PSICasing Dimension(L x W x H): Approx. 82 x 82 x 52mm(3.2 x 3.2 x 2 inches)Color: BlackPackage includes:1x air compressor switch control