The charger has 4 standard USB ports. No need to look what port to connect any device.
An On / Off button is present to turn the charger when it is charging, and to consume nothing when not charging. Presence of a lit LED indicates the status of the charger.
To learn more about this charger, I wrote a complete test on my site Justegeek.fr (independent test, not from the manufacturer but from my own use of the product).
In conclusion, I recommend this article.