The acquired here "original" charger (ETA0U81EBE) with charger cable for the "Samsung Galaxy S4" provides only 5V * 1 A. The Samsung with the Galaxy S4 (GT-I9505) charger approved (ETA-U90EWE) + charger cable but delivers 5 V * 2 A.
Result: The output of the product advertised here is only half as large as that of the original charger.