USB 5V to 9V 12V jack 3.5 4.0 5.5mm Connector Charger Power Cord Cable Adapter
Connector A: USB 2.0 A Male. 1 x USB Step-up Converter. Connector B: 5.5mm x 2.1mm, 3.5mm x 1.35mm, 4.0mm x 1.7mm, 5.5mm x 2.5mm (optional). Interface Properties: USB hole convert to DC round hole. Plug and play, convenient to use.