Describe an electronic device that you find useful. YOU SHOULD SAY: - What this technology is - How you learned about it - How often do you use it

Along with the rapid development of technology, a number of technological devices have been launched to people. The modern one that is the most useful to me is a smartphone. 

I just bought my smartphone at the beginning of this year because I found it quite nice and has many useful features that facilitate my school work. Firstly, its wifi connection is incredibly fast making it easy to download lectures and homework. Thanks to this, my study became simpler and easier. Another feature that I really like is its camera. The smartphone is like a miniature digital camera that I can take anywhere. Moreover, the captured images are extremely sharp and vivid.

For those functions above, the smartphone is an indispensable thing for me that I carry with me all the time when I go out.