Like many of us, I really do depend on my smartphone. However my Samsung Galaxy GrandPrime had an issue with it's charger port, where the cable would have to be "just right" to charge which was a headache beyond belief. So I decided to fix the problem by getting this external wall charger and a spare battery.
I'm loving it now, and while it is a little slower to charge it this way, with two batteries the time thing isn't really an issue. When it's charging it lights up purple, and when it's done it turns to blue. The charger I had gotten is pretty much universal as you can adjust it to fit almost any smartphone battery.