I remember in the early to mid 80's, there used to be a tiny ear clip on transistor radio called "the bug". It was preset to the Jay's game (AM 1430 in those days) and nothing else. Power on, set volume, clip it on your ear and Bob's your uncle. Exhibition Stadium was loaded with people wearing these things, especially the elderly. I tried it a few times, but as a teenager, it seemed odd wearing that thing. There was almost always someone with a traditional transistor radio listening to the game where you could hear if you were in the vicinity.