Application: 1.When standard USB input is 5V,5.5x2.1mm port output is 5V,when QC3.0 USB input,5.5x2.1mm output is 12V,your USB adapter must have for QC 3.0 output,standard USB input,output is 5V,can not Step Up to 12V. 2. With this cable, you can connect your power bank to router. Thus, when power cut, you can use your qc3.0 USB power bank to supply your router. 3. Use this cable, you can supply your car air purifier LED strip light by power bank 4.For 12V WiFi Route,Light for Cat, switches and other other 12V Device (power Less than 18W ) Specifications: Input Voltage: 12V QC3.0 USB charger Output Voltage: for DC 12V Output Current: 1.5A max Max Output Power: 18W max Cable Length: Approx. 100cm Color: Black Input interface: standard USB 2.0 male Output Interface: 5.5x2.1mm Plug (Inside the positive,outside the negative) Quantity: 1PC (other accessories in the picture is not included) Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 X QC3.0 USB to for DC 12V 5.5x2.1mm Male Step-Up Converter Adapter Cable