It provides transfer rates ultra fast data: 4.89 GO in 5 minutes 30 seconds from my USB key to my computer. Backwards compatible, it supports USB 2.0 models and 1.1. I have not noticed any decrease in transfer rate using the 4 ports simultaneously.
With 3 intelligent charging ports (they automatically detect your device charging mode), it can connect my I-Phone, the external battery and recharge my camera while working with USB ports.
In summary, this is a good product for large data transfers, but also to charge through its own power supply 3 A, to connect a second monitor, keyboard or mouse