Peripheral GMOS21B Radio replacement Interface for Select GM Vehicles Retain On-Star and Bose

The GMOS21B is a plug and play interface kit that allows replacement of a General Motors factory stereo without RDS (Radio Data System) option and maintains operation of both the OnStar system and the Bose amplifier and speakers. The kit includes the GMOS1 OnStar interface and the PFS1 premium sound system interface and cable. The GMOS1 has on board switching and amplification to allow audio from the OnStar system to play through the two front factory speakers when OnStar is active, as well as mute the new replacement radio. The GMOS1 can also be used when a stereo and aftermarket amplifier combination system is installed. Separate speakers can also be added

• Plug-and-Play interface to add a replacement radio to vehicles with OnStar & Bose
• Audio from OnStar plays through front two speakers
• Mutes replacement radio when OnStar is active
• Seamlessly integrates replacement radio with factory Bose amplifiers