When a device is connected under this profile, it typically enables the following tasks:

Here is the breakdown:

On many Xiaomi/Redmi devices (and some Lenovo tablets), the USB controller is integrated into the or the main SOC. When this chip fails due to:

Sometimes, the device is functioning correctly, but Windows fails to automatically locate the correct driver from its local repository. It assigns a generic label ("USB Composite Device") but flags it with a yellow exclamation mark because the specific 901D functionality is not enabled.