LANMU 1M USB DC 5V To DC 9V 2.1mm X 5.5mm Module Converter DC Barrel Male Connector Jack Power Cable Plug (5V To DC 9V) Reliable and fast data transfer. With this cable, you can connect your power bank to router. Thus, when power cut, you can use your power bank to supply your router! Internet blackout solve baby, continuous power supply Artifact Use mobile power,charging treasure or notebook usb interface Drive after a power outage or optical router cat online Via computer USB jack to power other devices. Such as: USB lights, USB fan, Cartoon watches, radiator, 5V mini speakers, USB HUB, etc.