First, the instructions you receive are contradictory, for example: the brochure that you receive with the product says that the battery often gets hot when charging, but the seller sends an email, in which he says that if the battery gets hot while charging, write to him. (Battery stays cold while charging). The instructions are very incomplete, for example: the instructions do not say what happens when the power button is pressed. Pressing the power button turns the device on and pressing it again toggles between the units used (e.g. PSI, KPA, Bars). The device comes with a variety of valves that you can use, but I bought it specifically for my car: for a car, you get a 10-inch flexible rubber hose with a small bike chuck. It is difficult to hold this air compressor and attach the air cartridge to the tire valve. (Manufacturer's Suggestion: Make the air liner shorter and fully rigid, this air compressor is in the shape of a drill. So if the air liner looks like a 'drill', you can just point it into the tire valve. The air liner should still have one locking mechanism). The locking mechanism on the air chuck worked exactly the opposite of what I use to inflate bike tires, which was really confusing. When I finally got the device working, it did an amazing job. While pumping air the display will show the current pressure on a nice LCD screen, when it reaches your desired pressure (instructions on how to set your desired target pressure are the only good instructions you will get) it will stop.