Will this CD player work with a 2021 Nissan Altima thru the USB plug? Does it have the software in it to allow it to be controlled by the steering wheel radio controls? Thanks, Roger

Yes, this unit is universally compatible and uses existing controls as though it were a USB drive. Any controls that you have for a USB stick it will have the same controls for this unit. We have had limited compatibility with 2020 and 2021 vehicles. There is about a 50% chance of this unit working but it is fully returnable if in the event your vehicle is not compatible.