I have not used all three ports at the same time

There is an LED that glows to let you know that the charger is working correctly

Each port works separately and charges my iPad and iPhone very fast

compact with the USB plug, it can work all of the 4 port at the same time, also fast charging

I have charged two devices at the same time with no change in recharge time

This is a very attractive charger that offers four charging slots to charge whatever devices you or your passengers may have and is overall, very nice!Highly recommended This is a great charger and is held up well since I receive this many months ago