Plug & play. Installed via OEM CD changer port, integrated with the car.Connected via CD changer port without interference or loss of sound quality. 3.5 mm standard AUX function, you can enjoy music from all AUX portable device,like iPod,Mp3,PSP etc. Extra USB function for charging your phone and enjoy your long time journey. Connet via car radio CD changer port,avoid FM sigal noise interference.Bulit-in premium Bluetooth chip transfers CD quality sound.Echo and noise reduction technology for non-stop clear call conversation & dynamic music streaming experience. Support Steering Wheel Control and Radio Panel Control, for your cosy driving.Grounding noise is caused by ground loops which happens when the audio source and the speaker use the same power source. Built-in bluetooth 5.0 and Build-in high performance mic and clip-on design, for your clear hands-free calling and safe driving.