Retains OnStarĀ® when the factory radio is replacedRetains Factory Bluetooth (2009+ model vehicles)Retains rear seat audio controlsRetains all warning chimes (chime module included)Retains back-up sensors/park assistRetains factory BOSE audio systemsRetains factory premium BOSE audio (does not support fading)Supports non-amplified audio systemsBuilt in pre-programmed SWC retentionDual zone functionChime volume adjustment (factory buttons)Rear Seat Entertainment RetentionOnStar volume adjustmentRetained accessory power output (R.A.P.)Reverse Wire outputVSS (Vehicle Speed Sense) outputIllumination outputParking brake outputIncludes antenna adaptorRetains OnStar Turn-By-Turn voice prompts![](https://pics.ebay.com/aw/pics/viewitem/fe/imgFePowered_88x33.gif)