This is Preston from class 1-09. Here is my bad design video that I have created. It's about a portable radio that has buttons which could not be recognized to switch radio channels. (I am not insulting this radio and its manufacturer, I am just pointing out some disadvantages of it.) Here is my video:
I suggest that the manufacturer should replace the shapes at the bottom of the buttons to the letters "F.M" and "A.M", or otherwise which allows the user to easily understand what the buttons are for.