This model is a switching-mode power supply ,
operates at input DC voltage 12V to 15V
and output DC voltage of 15V/16V/18V/19V/20V /22V/24V DC,
output current 5 Amp max ,
Output USB port : 5V@2A max
output power 120 Watt max,

with 8 PCS tip connecter to suit to almost laptops ,
select output woltage 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.