ITEM NAME:260PSI DC 12V Portable Electric Mini Tire Inflator Air Car Auto Pump For Car WJ Specifications: PSI: 260 Voltage: DC12V Power: 120~150W Material: metal & plastic Automatic Operation -preset the pressure value: Plug the cigarette lighter into the 12v socket. Screw the valve connector clockwise onto the tyre valve voice. Ensure the connector is well connected with the voice. Push the ON/ OFF for the compressor to start, when the pressure value reaches the required value. The ON/OFF button can be used to override the preset pressure value if required. Package includes: 1 x Air Compressor 3 x ball adaptors.Screw the valve connector clockwise onto the tyre valve voice. Ensure the connector is well connected with the voice. Push the ON/ OFF for the compressor to start, when the pressure value reaches the required value.