HP Compaq AC Adapter 18.5V 6.5A 120W PPP017H HP-OW121F13LF SE Genuine replacement Input: 100-240V~ 2.5A 50-60Hz /Output: 18.5V - 6.5A 120W Connector size:A:Inner diameter -5.5 mm Barrel Connector with Positive inside Connector size:B:Outer diameter - 7.5mm(Picture 4) *Please do not mix up with another adapter with the same model number but different connector size, please check carefully the connector's measurement of your adapter.