... use in 12V car.The follow 2 functions be use discerptionFunction 1:AC adapter part :Operation at input AC 100V to 260V ... 12-15V 10A MAx, output DC12,15,16,18,19,20,22,24V,100Wwatt max, with Overload protection, Short Circuit protection ,power supply by ... needs before using. Adjust and Select output voltage 12-24V to suit to laptop before use. Specifications:Power Output: 12/15/16/18/19/20 ...