Smart AC power adapters from HP power your notebook and charge the internal battery simultaneously. These adapters provide you with the ability to power your notebook when away from the office or on the road. The HP 90W Smart AC/Auto/Air Combo Adapter can power up your notebook on the aircraft of any airline or in your car. - Provides a convenient and portable power source for use in a mobile environment; - Compact design makes HP Smart AC Adapters an ideal travel companion; - Convenient "Charging" switch on the HP 90W AC/Auto/Air Combo Smart Adapter toggles between charging and power-only voltage levels to allow you to use your notebook in all automobiles and to recharge the notebook battery when attached to electrical outlet or auto power (12V and 24V); - The HP 90W Smart AC/Auto/Air Combo Adapter powers your notebook when attached to an electrical outlet, auto or aircraft power charger depending on model.