First one of these was great, worked as expected, really happy. So I ordered a second one but that did not work. It did initially but a week later it did not. I hoped that this would be a simple case of send it back and receive a replacement, but I contacted Anker and it was not so simple. Numerous emails exchanged, with Anker asking me to send proof of purchase (although I contacted them via the Amazon website which linked me to all of those details), and another requesting full explanation of the fault. The item doesn't work, that's the fault. I have another one, that works, I know how these things work, but this one does not work. I am left with the feeling that all of these emails and questions are designed to make me give up on seeking a replacement and go away. I would have thought a no questions asked return would be simplest, saving my time and their time, and they can work out what is wrong with it when they receive it back in the post, rather than ask me to do the diagnosis for them. That's how every other seller does it. So yeh, bad experience, will not deal with this company again.