With this cable, you can connect your to router. Thus, when power cut, you can use your qc3.0 USB to supply your router. QC3.0 USB input,for port output is 12V,your USB adapter or Powerbank must have for 3.0 output,using an ordinary 5V the output voltage is also 5V,can not Step Up to 12V. For 12V WiFi Router,Light for camera,switches and other other 12V Device (power Less than 18W Use this cable, you can supply your car air LED strip light by QC3.0 USB Good compatibility, a variety of digital interface devices. For example, router, car air camera,