Axxess GMOS-LAN-01 LAN OnStar Interface for Non-Amplified Systems Interface designed to allow the replacement of the OEM Radio with an aftermarket receiver in non-amplified 2006-2008 GM Vehicles that use the new GMLAN Data Bus system Retains full functionality of the OnStar system Retains warning and safety chimes with adjustable level output Output for audible turn signal sound.Retains balance and fade Retention of the Retained Accessory Power (RAP) convenience features Compatible with non-amplified 2006-07 GM vehicles Retains OnStar with adjustable volume output Retains chime with adjustable volume output Output for audible turn signal sound Retains RAP feature