It allows, through the 24V cigarette lighter, to power notebooks and netbooks with a 12 to 22V input. Selectable output power supply. Protected against short circuits, overloads and overheating. Equipped with 13 interchangeable connectors for wide compatibility with many laptops. Also equipped with USB port (5V - 1A). Size: Input: 20-30V - Output: 12-15-16-18-19-20-22V - 120W - USB: 5V - 1A