This does work and it is handy that it's small and fits in your keychain. However, I bought it the end of April last year, and it is already coming apart at both ends because of the awkward angle you have to put it/your phone to charge it anywhere besides a laptop or portable charger. I also don't like that I have to remove my case and then put my phone in a precarious position to charge it. This is pretty expensive for something that breaks after less than a year and isn't the easiest to use.
My phone dies a lot because I'm horrible at making sure I charge everything - this definitely comes in handy! Just a little hard to take on and off the keychain when I need to and the end is a little thick so I have to remove the bottom part of my case to charge it -- either way I love it.
This has gotten me out of dead batter situations so many times. I love that it just hangs out with my keys and no one knows it is there. I wish it was retractable since I feel like the shape/charging of my phone is always a bit awkward, but I'll take awkward over a dead battery.
Comes in handy
When going out, or at a friends place, I have lost many a chargers for my iPhone, which is frustrating. This thing keeps a charger on you at all times, which is useful for the iPhone 5 which has a terrible battery life.
Is just the perfect keychain charger in one, no one knows no ones takes it from you, forget the days looking for a charger or going back home because you left it there!!! Must buy for iPhone users and loved ones