I have replaced the extra cigarette lighter socket in my old SUV with this dual USB plug which connects to 2 USB upstream ports on a new Pioneer Navigation/Stereo head unit I recently installed. Now I can connect my iPhone for CarPlay and charging (same for Android Auto). I preferred the 2 USB version to the 1 USB version because (1) the main unit has 2 USB input ports, so why not, and (2) there is no LED indicator on that connector because it's difficult to see him in the car. At night I use the 2nd USB port for a tiny USB LED to light up the 1st USB port. My only suggestion to the manufacturer is therefore to put a small LED light in this connector, as is often the case with car USB charging adapters.