The invention of a device for deaf people. Why did we choose to do this project and how did we do it?Firstly, my friend’s grandfather is deaf so this cause was very involved to her because she wanted to make him smile again. First of all, we have researched the subject because «sound» is a very vast environement. Then, we found some informations about what sound was and we made a lots of experiments on tis subjet.Finally, we moved on the practical part, we welded and assembled everything so that the project worked. To conclude, our project is to make the deaf people feel music trough vibrations.