Compaq Presario Ac Adapter C306us C307nr C500 C500t C501nr C502ca C502us C503wm C504us C506ca C507us C508us C509nr C550 C551nr Power Cord Power Supply 65 65 Watt 5 year warranty Over current, voltage protection 18.5V,65w ,3.5A low price,quality replacement to oem equipment compatible to orginal manufacturer equipment