You can use this product to connect the power bank to power the router/optical modem, and you don’t have to worry about power failure and no network.
Interface nature: USB to DC round hole
Voltage input: 5V
Voltage output: 9V/12V
Maximum output current: 9V2A 12V1.5A
Cable length: 0.8 meters
Accessories to buy: 3.5*1.35 adapter as a gift
1x USB to DC5.53.5mm router optical cat booster cable 5V booster to 9V12V charging cable