the OnStar mirror is the exact same thing that's in a Chevrolet only difference is that it dosen't have the theft locating system with it which is where if someone steals your car and you report it OnStar can lock the car with the thief inside, cut off the cars power and turn on the flashers with it showing on the dash and reports to police where the exact location of the care is. other than that its the exact same thing.