Please note that this product requires a 12V DC cigarette lighter to function properly, and the vehicle must be in a running state. (This product cannot be powered by battery.) It is equipped with a 9.8-foot cord, making it suitable for most regular-sized vehicles. PROGRAMMABLE INFLATION: Use the 'M' button to set your desired pressure unit, and then press the '+' and '-' buttons to set the desired pressure. The air compressor will automatically shut off when it reaches the pre-set pressure (Please make sure the pressure you set is higher than the current pressure of your tire). COMPACT SIZE & EASY TO STORE: Featuring a lightweight and compact design, this handy and portable tire inflator can easily fit into glove compartments, seats, trunks, and more. When it isnt being used, its almost unnoticeable. SMART PRESET & AUTO OFF: The tire inflators digital screen provides accurate readouts and 4 pressure units to choose from while its independent buttons allow for intuitive control. You ca