This listing is for an excellent condition Delco 5 EQ cassette radio. It is refurbished and is fully functional. This cassette radio was modified with Bluetooth for music only. Once you push the MUTE button on the volume knob it will cut out the signal from the radio and play. Push MUTE again and the radio will play. New capacitors were installed on the amplifier circuit board. To help with the installation of an aftermarket amplifier. The black face, green display and back lights match the stock mid-eighties Buick Grand National, Regal T-Type or GNX radio face, so it will look like a stock radio in your vehicle. It will also fit many other mid-eighties GM vehicles: Chevy. Monte Carlo SS, El Camino. GMC S yclone, GMC Typhoon, Camaro, Corvette, Hurst Olds or Olds 442. No code is set in the Delco Loc II security feature, but I will send instructions if you would like to set up a code. This radio is ready to plug in and play! This radio and adapter harness will also work with a factory power antenna and the Concert Sound option on Grand Nationals. I will include the specially modified chrome knobs for the Grand Nationals, Monte Carlo SS and Olds 442. The stock G-Body cassette chrome knobs stick out too far when mounted on these cassette radios. These knobs fit and look like they should! I will include the aftermarket wiring adapter for your factory radio harness, so it will plug right in for you. Transfer the brackets from your OEM cassette player and it bolts right in. All functions work perfectly: Bluetooth, RCA amp outs, cassette player, radio and lights. I know you will not be disappointed with this cassette player it is in excellent condition. Please note: This radio is not compatible with Bose amplified speaker systems. IPod, iPad, iPhone, Android, smartphones or other Mp3 devices are NOT included with this listing.