GPK Systems 65w Auto Power Adapter for Hp Probook 4425s 4510s 4520s 4710s ; Hp Elitebook 2540p 2740p 8440p 8440w 8540p 8540w 8740w ; 463552-003 463958-001 Ppp009l ;Charger Auto Truck Adapter Car Charger Power Cord Input: DC 11V - 16V Output:18.5V 3.5A 65 Watt Service & Support 1 year warranty Use minimal power this adapter is designed to save energy Designed exclusively for use with the laptops 100% compatibility with the original