Pong games have been around for a long time, but this APF console is one of the very early ones. The concept of 2 goalies bars and a ball bouncing back and forth can easily be changed slightly represent many games such as tennis, hockey, squash, and single handball.
The TV Fun series were the first consoles APF put out, before this they made calculators and other small electronics.
The earlier 401 model home console was the first one to use the General Instruments AY-3-8500 “Ball & Paddle” CPU.
The RF cable is built into the console, but also replaceable from a connection inside the case. The sounds came from a speaker built into the console. The console can be powered by a power brick or 6 C batteries.
Mine had these ancient batteries installed, I have removed them. Its always cool to see old batteries, especially when they did not leak acid.
Source:
https://www.old-computers.com/museum/computer.asp?st=1&c=1009
https://en.wikipedia.org/wiki/APF_TV_Fun_series
http://www.thegameconsole.com/apf-tv-fun
https://www.mobygames.com/game/apf-tv-fun-model-401
https://gamemedium.com/console/tv-fun-series
AtariAge forums talking about the console, with pictures of the box, and the console working: https://forums.atariage.com/topic/165173-apf-tv-fun-model-401a/
PDF of Manual on AtariAge forums: https://forums.atariage.com/applications/core/interface/file/attachment.php?id=165679