[chbot] !!!Choc fish challenge!!!!

[Charles Manning]

I hereby off a choc fish to the first correct answer to this question...

In this crazy world we live in, electronic gadgets change all the time. Try to 
find something you bought last and you will find it has been replaced by a 
different model.

There is, however, one electronic gadget that has been in production for a few 
decades. Same model. Same function. Still in production.

What is it?

Charles