2009 - 2010 - 2011 Chevy HHR Radio AM FM CD Player with Aux Input. For use with iPod, iPad, iPhone, MP3 Player, Sirius XM Satellite, Android Phone & more! Part Number: 20919523. Interchange Part Number: 638-02954. Compatible Part Numbers: 20795331 / 20795332 / 20835355 / 20835356 / 20919522 / 25833528 / 25833530. Option Code: US8. This radio will need to be unlocked by a GM dealer and paired to your vehicle. See below for details. This is for an AM FM CD Player for 2009-2011 Chevrolet HHR Vehicles. Please confirm that this is the radio your vehicle requires as some of the vehicles used more than one style of radio. This radio has been cleaned, serviced as needed and thoroughly checked. Please Note: This radio will need to be unlocked upon installation in your vehicle. It can be put into a fully functioning test mode for 10 minutes at a time but will need to be taken to a dealer for permanent pairing. This generally costs around $50 but will sometimes be done for free if you have a relationship with the dealer as it is a 5 minute process. Please make arrangements before purchase.