USB Female to DC 5.5x2.1mm Female DC Connector Charge Barrel Jack Power Adapter USB Connector,for DC or USB Charging 1.Connectors 1:DC 5.5x2.1mm female jack.Connectors 2: USB female jack. Output: DC 5.5x2.1mm female jack or usb female jack (Note: Please ensure the size of the DC adapter before purchase) 2.Power or charge USB devices via standard DC plug/adapter,Applicable to a variety of small electrical appliances, mobile phones, MP3, MP4, digital photo frames,U disk, USB charger 3.USB port can also charge DC devices,The DC 5.5x2.1mm port is widely used and is extremely convenient for a variety of devices such as DVD players, LCD monitors, Fan, Desk Lamps, Bluetooth audio, Wireless Routers 4.Use power adapter with a barrel connector to power and charge USB devices.And the USB port can also charge DC devices.