Dear,
Thanks for contact us and apologizes for the late response.
1.yes, Steering wheel controller, and OBD-II are compatible with this unit.
2.our unit has build-in Wifi / Bluetooth,once plug the power harness,they will work perfectly.
3.yes, all of them can be connected at the same time.
Could you please send us the photo of your car's dashboard to [email protected]?
And could you please tell us the model and year of your car?
Then we can help you check if this unit can fit your car or not ,hope you could cooperate with us.
Looking forward to hearing from you soon.
Thank you & Best regards!
By
Seicane