The cable supplied could afford exactly what was stated in the article description. On my Google Nexus 5 I can with the aid of USB flash drives and 2.5-inch hard drives connect to read and write. Also the Playstation controller can be used with the cable as an input device for various apps (FPSE / Drastic). Thanks to the external power supply through the Y-cable to the controller battery does not discharge too and the phone battery will not lose 1% of the battery voltage. The Nexus is not charged according to display through the cable, but the display itself costs use during the time the mains voltage of no%. Great part, which I do not want to give up!
Edit: I've now found that it depends on the charger cable used if the phone battery is discharged or not. Man playing with DualShock 3 controller on a Samsung Galaxy S2 charger, the phone battery will discharge my Nexus 5 is not. When using the original Google Nexus charging cable to the phone battery has discharged a bit. Unfortunately I had not enough charging cable is available to detect a regularity of it.