This Portable Air Compressor Has A Small Electric Motor That Compresses The Air In A Small Attached Cylinder Tank. It Can Be Plugged Into A 12v Car System For On-the-go Repairs Or Inflation. It's Ideal For Car And Bicycle Tires, Sports Balls, Etc. Because It Can Be Powered Through A Cigarette Lighter In Your Vehicle, It Is Incredibly Versatile And A Lifesaver In Some Instances. Features: It Is Equipped With Pressure Checking Gauge. -maximum Inflatable Pressure Can Be Up To 300psi. - Use The Car Cigarette Lighter Power For Fast Filling. the Barometer Can Measure And Display The Pressure Accurately. - This Item Can Commonly Pump The Tire To Normal Pressure In 2 To 3 Minutes. Operation: 1. Plug Power Cord Into Dc 12v The Cigarette Lighter Receptacle. 2. Start Up The Engine And Turn On The Switch. 3. Push Connector Of The Pump Toward Air Value Of The Tyre, And Screw Up. 4. The Gauge Will Indicate The Pressure Of The Tyre When It's Aerating. 5. Pay Attention To The Pressure Gauge, Usually You Can Stop After 2 To 3 Minutes. Working Voltage: Dc 12v , Maximum Pressure: 300psi , Fits: All Cars . Product Weight: 465g .