I mean there are many products like this one. How to select the best one ? My one call Promini and it labeled the point that larger current outputs. What’s that mean?
The one you are using may have large current output so you can charge more mobile device in the same time. For example if you have totally 6A output and each device take you 1.8A for charging. You can charge 3 devices in the same time with full charging speed.