I bought it so that I can charge my phone and e-cigarette simultaneously from the car lighter. With the 2 ports it has, it is very convenient for this job. I used it extensively on a trip during the summer and it worked flawlessly, although I have the feeling that when it charges both at the same time, it is slower than when it charges each one separately - but maybe it's also because of the cables, I'm not sure. Very convenient that it also tells you the battery voltage. It can be useful in cases of battery or power problems. It seems to be of good quality, it fits correctly, and overall I am satisfied with the purchase.