USB DC 5V to 9V 5.5 x 2.1 mm Male Step up Converter for WiFi Router - CB33
Product Application:
With this cable, you can connect your power bank to the router. Thus, when power cut, you can use your power bank to supply your router!
To power car air purifier or LED strip light by power bank
For 9V WiFi Router, Light Cat, switches and other equipment...