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I think de most important are :
Mobile phone
Remote control
Laptop computer
Microwave oven
Digital camera.

All of them are growing up with us in our life.

I agree with you, Enric but I would like to change the last one.
I think that the digital camera has lost importance because now they are integrated into the mobile phone. However, in my opinion, the memory card is very usefull in differents electrical equipments.

Yes, I would also change the digital camera for the memory card too, for the same reason as you Agi.