Not programmable examples: Ancient mp3 player that uses regular AAA size batteries. Still in use, now and then. Not being able to economically replace batterie

Not programmable examples: Ancient mp3 player that uses regular AAA size batteries. Still in use, now and then. Not being able to economically replace batteries has doomed many other devices I've owned. Got rid of a forty-year old Sony alarm clock with a snooze alarm that auto-reset for the next day just this year, for reasons of weight; it still worked well and was in use.