I loveee this back up charger. I keep it with me at all times and use it atleast once a week. I bought a nomadkey from Birchbox, too, and I use them together! I love how thin it is!
I got one of these to use with my Iphone 5S I had to buy an extra cord to plug it into my phone. Even after charging it overnight, it has never worked with my phone. Beware of the universal charger claims. This is the second time I have tgotten one of these from a subscription site. Very dissatisfied! I couldn't even try to send it back because I threw away the pagkaging. Would have given 0 stars, but it's not one of the choices!
This little thing is very effective. I have a Samsung galaxy 6 and it is quite the the battery pig. This will give it a full 50 % charge. And my i pod touch 80%. And that is starting from 10% or less. It's the size of a credit card. I recommend this product.