This model is an universal auto and airplane adapter , operates at input DC voltage 11V to 16V and output DC voltage of 15V/16V/18V/19V/20V DC, output current 4 Amp max ,output power 80 Watt max, with 8 PCS tip connenter to suit to almost laptops , select output voltage to suit laptop and make sure the polarity of tips connect correct before use , with many protection functions use for the notebook computer supply by 12V car battery.