App shuts off by itself won't connect to my swiper generally a very frustrating experience to use and I've used many different brands this is by far the worst. What's even better is I called the number that you left below for help and was told we can't help you with anything you have to call your card service provider so y'all are liars on top of faulty equipment. I told the woman that I was calling the number left on Google Play for help and she said no, no one gave me that number ........