The GM Radio Control Unit 85586031 is a specialized in-car entertainment system designed for use in vehicles specific to the 2015+ Express/Savanna and 2020 Tahoe models. Manufactured by GM, this radio control unit offers convenient features for controlling audio and possibly additional functions within the vehicle. With a focus on providing a seamless and user-friendly experience, this unit is a key component for those looking to enhance their in-car technology.