2004 – 2005 Chevy Trailblazer &GMC Envoy Radio AM FM CD Cassette Player — For the BOSE Sound System Only — Part Number: 15094272. Option Code: UB1. This radio will need to be unlocked by a dealer and paired to your truck. Please see below for more details. This listing is for a Chevrolet Trailblazer & GMC Envoy factory OEM AM FM cassette CD radio that has been professionally remanufactured. This is for the Bose sound system only! If you do not have the Bose sound system, this radio will not work for your vehicle. This radio has been cleaned, serviced as needed and thoroughly checked. Part number is 15094272 with option code UB1 so please make sure this is the correct radio for your vehicle. Please note that this radio will need to be unlocked by a GM dealer upon installation. Please confirm: that this is the radio your vehicle requires as some of these vehicles used more than one style of radio. Although this radio looks the same as the one used in cars, it is electronically different and will not work. Feel free to give us a call with compatibility questions. 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 process varies greatly from dealer to dealer, verify cost with your local dealer before purchase.