Costar Bluestar Hands Free Bluetooth Kit for GM Vehicles Hands free Bluetooth car kit for GM vehicles. Replace ONSTAR with BLUESTAR - No monthly fee. iPhone / Android compatible. Fully integrated using radio, existing vehicle microphone and steering wheel controls. Easy installation, plug and play, no wiring needed. Contact seller or Amazon Customer support for vehicle specific installation instructions or help during install. Fully adjustable audio controls (mic and output) can be modified to your particular installation. Noise and echo cancellation included, but may not be suitable for loud vehicles / convertibles. Stereo streaming supported, but additional wiring and aux input required. (vehicle wiring is mono)