Plug-in power supply for charging and operating devices such as notebooks, laptops, or netbooks in cars or trucks. The power supply provides stabilized direct current to mobile small devices with a voltage of 1.5-12 V DC. The universal power supply connects to the vehicle's power outlet (cigarette lighter) with 12-24 V. The car power supply saves the need for additional chargers and adapters thanks to its interchangeable round plugs. The output voltage of the car charger is adjustable via a dial, allowing for 1.5 V, 3 V, 4.5 V, 6 V, 7.5 V, 9 V, and 12 V at 2 A. The voltage of the charger can be easily set using the included adjustment key. Six adapter tips are included: 2.5 mm jack plug, 3.5 mm jack plug, DC barrel connector 3.50 x 1.35 mm, 5.00 x 2.10 mm, 5.50 x 1.50 mm, and 5.50 x 2.50 mm.