The way you can tell if the Belkin is charged is by pushing a small button on the side which will illuminate 1 to 4 led indicators to let you know how much charge it has. It had two lights on when I received it. I plugged it in and charged it to a full 4 bars (small round lights). With these type of devices, you want to keep them fully charged when you aren't using them.
We have had plenty of storms this year that have made our electricity go out for more than 8 hours. I already have one larger charger, but I wanted something small and sleek that I could take on trips and not have to deal with much weight and without sacrificing much space in the backpack. This charger fits the bill.
As with most of these type of products, it contained a USB cable for charging, but it did not include a power brick to plug it into. I have several ways to plug in USB these days, so it isn't a big deal, but I still wish companies would include the power plug rather than have customers looking around for a solution.
All in all, I like the small, slim, pocketable size of this charger and the fact that it is made by Belkin. It uses a 2.4A total output to quickly charge your devices and its indicator lets you know if it is fully charged and how much charge the battery has left in it. In other words, it works great for my purposes.