First, let me say, I’m NOT a tech wizard, but I can tell you how this power pack worked for me. This is the perfect portable charger for me! I bought it to take on vacation and it performed very well. It fits easily in my purse so it was always handy when I needed it (I have an iPhone 8 and my battery is very close to needing to be replaced!) It’s the same size as my phone so if I needed to charge my phone while we were out I could easily insert the lightening cable and either hand-carry them, for phone use, or put them in my purse (or pocket). The LED display is very handy so you know how much charging power you have left. I charged the power pack every other night by simply plugging it into a wall socket…how easy is that?! So, say goodbye to that lightening cord and cube while you’re on vacation! (There is also the USB input so you can charge your laptop or tablet.) I highly recommend this VRURC Power Pack!