DC Power Adapter Cable Charger TIP Converter Blue For HP Dell 7.4mm To 4.5mm
4.5x3.0mm Male to 7.4x5.0mm Female DC Converter Adapter Cable for HP Dell Laptop. It is 7.4mm X 5.0mm Round Jack (old type) to 4.5mm x 3.0mm Plug End (new type). Can convert round connector to square connector.