Product Application: 1.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! 2. Use this cable, you can supply your car Air Purifier by power bank USB cable USB to DC5.5 * 2.1mm charging cable power supply cable hole 5V/9V/12V boost lines USB cable Introduction: by charging treasure to power other devices. Such as: routers, USB lights, USB fan, radiator, 5V mini speakers, and so on … DC power plug size: diameter: 5.5mm, inner diameter: 2.1mm; positive with 1 meter cable length Difference between the three lines 5V straight through: pure power cord, USB input is 5V, power DC plug output is 5V 9V boost line: With the boost components, the input voltage of 5V via USB components, the boost to 9V voltage 0.8 – 1A 12V-through: with boosting components, the input voltage of 5V via USB components, boosted to 12V Voltage 0.8 – 1A 1: Voltage Selection Pro directly in back of the product label, or you can see the power products, power supply input 5V, 9V and 12V standard, depending on your router to choose our pro corresponding boost cable. (9V, 12V output boost line 0.8 – 1A, if you are a product you can not use more than 1A) Pro can direct most of the routers are the outer diameter of the inner diameter of 5.5 * 2.1 colour:black Material:ABS Package Contents: 1 * USB Converter Adapter Cable Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.