What about the cell phone?

It's a little hard to explain. In the one hand a useful tool, in the other hand we have a dangerous toy. Can be a our entire life or just a simply way to make the job easier. Some people use it like a poket computer, like a video game console, like a music reproductor, like a credit card, like a bank literally, it has become the most important piece of tecnology in the last few decades. Often it is completely necesary in the current society cause, in some case, when you want to make your bussinnes grow up and you can share adds on social media, you can buy something miles from you in just a click away. Is the most versatile piece of technology, and also most distribuited. Nevertheless, like any other drug can develope addiction in users, it's a dangerous device for children with no parent's supervition, the battery used it's highly harmfull for the ecosystem, for saying something.
I'm not sure about its recomendable under some age because can cause social complex, but is a really good tool for the current world jobs