Earlier quoted context omitted.
Surely an electronic wrist watch is fine, and maybe an mp3 player. Also graphing calculators.
Do graphing calculators actually help people learn? We used them in high school, but when i needed to take calculus in university we didn't use them. I'm doubtful they are good for learning especially when trying to teach the foundations.
All of that mostly comes up in physics and chemistry were its about knowing what long formulas you need to plug the numbers you have available to you to find out what you need to know. Oddly enough their seems to be very little benefit to using a graphing calculator in a actual math class.