1) Maximum input: 11 - 15V DC 12A 2) Maximum output: 15 / 24V (15V, 16V, 18V, 19V, 20V, 22V, 24V)3) Total length: 2m 4) Suit for most brand laptops such as Dell, IBM and Toshiba How to use? 1) Moves the toggle switch to the scale corresponding to the voltage of the Adapter, and then put on the protective cap to the corresponding voltage 2) Selects a suitable DC adapter head and connect it to the DC output Terminal 3) Inserts the car charger into the cigarette lighter of the car, when the greenLight of charger turns on, normal use can be started