Some models are equipped with a USB charging interface on the armrest box, and only need to connect the data cable to achieve charging. However, before use, you need to confirm whether the USB interface has been opened, in some models, the USB charging interface may have a switch, you need to manually open its power switch. If your model does not have a switch, you can ignore this step.
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Next, you just need to plug one end of the power cord into the car USB port and the other end into the device that needs to be charged (such as a mobile phone), and in general, the device will automatically start charging. It should be noted that although the on-board USB charging interface can provide convenient charging before, the charging power of some models is low, and the charging speed may be slow, at the same time, it is also recommended to avoid inserting the power for a long time to avoid damage to the vehicle battery.
This armrest box with usb interface requires additional wiring and is connected to the acc power supply of the vehicle. You can go to a car decoration shop and have it professionally installed