I received a single port USB hub, I thought it was suppose to be a double?

Some vehicles (such as the 2015 Focus, 2015 Mustang and 2016 Explorer) require the single port USB hub as this is the only hub that has a second mini USB hub on the back so it can connect to the other USB hubs in your vehicle. You can use a dual USB hub but you won't be able to use your other USB hub(s) to connect to Apple CarPlay and Android Auto.