 At least in my time, so this would have been in the late 70s, early 80s, there would be this kit with lots of electronic components already on it with springs. And then you took little wires to connect the different components to each other in a way that you might solder them together on an actual PCB board. But instead, you were sort of doing that. And almost every single one of them had a radio and or AM transmitter built into it. Part 15 kits that you could buy.