I ditched mine over 10 years ago when it would not shut up!!! Even with the doors shut, it would sit there and chime away. Anyhow, on my 85, it was a red box that plugged in under the dash on the driver's side. I believe it was about 4 inches long by 3 inches wide and 1 inch thick. The one on my dad's 1980 Cadillac was much smaller, gray and I forget where that one was. On an 84 Camaro it was a black box the size of the one in my 85 Cutlass. I still have all 3 of them, but my house looks like the set of Sanford and Son, so I have little chance of ever finding it. On the plus side, most of the clutter is G body related, so I have plenty of spare parts! :lol: