> For the complete documentation index, see [llms.txt](https://wiki.cbunmanned.com/wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.cbunmanned.com/wiki/products-eol/cbu-cm405-fc-eol/male-header-usb-hub.md).

# Male Header USB Hub

The CM4 is connected through a USB MUX to a 4 port USB Host Hub. The connections are broken out with male pin headers and are designed to be used with most PC Motherboard USB 2.0 breakouts. Power is provided directly form the onboard regulator (5v\@3amps).

USB 1 - Red

USB 2 - Blue

USB 3 - Purple

USB 4 - Brown

<figure><img src="/files/m5M5hPht5ZCLExeFC0nK" alt=""><figcaption></figcaption></figure>

The USB Mux auto selects between connecting the CM4 to the USB Hub (DIP (1) in OFF position) and the Micro USB for EMMC Flashing (DIP (1) in ON position).