Cobra radios (Ned's right, there were none with "readios) were an exercise in futility. As I understand it, they were originally aftermarket items intended for trucks, probably hung underneath the dash, hence the downward facing, inaudible speaker. One neat feature was that they were polarity-flexible; there was a small plug on the bottom that could be rotated and switch the radio from positive to negative ground so it could be used in vehicles with either polarity. Some said Cobra on the faceplate, others Motorola. I heard mine once, on a quiet evening at low speed. Then it quit, tried to get it fixed but radio repair shops just laughed at me.