I got this assuming I'd be able to charge two USB devices at once. That's not the case. When I plug in both a smartphone and an (ancient) iPod touch, it SWITCHES power back and forth between the two devices, making them constantly beep as they toggle between "unplugged" and "charging." And yesterday in my hotel room when I tried to charge both my phone and battery pack overnight? It didn't fill EITHER device. Overnight!! My phone went from 15% up to 84% and my battery pack stayed at a miserable 25%. Once upon a time this was a great charger, but it can't keep up with today's devices.