The MP3 player is very important for me, because I like too much listen to music when I go to the office and it makes me smile in the mornings on my way to work.
Mobile phone is essential, because if you have any problem you can fix it. For example, when you get lost you can connect the google maps and you can find the right way.
The microwave oven is not essential, because you can warm the food with the induction, but is more comfortable
Computer is in my case the most important thing, because I work with it. In my case a computer is not functional without a memory card, able to save my job.