Fortunately my item has a uk mains adapter. I was ready to send it back if it, like others have said, came with a two-pin plug.
It looks great, works well and saves you having to charge with a USB cable, which requires the console to be on. You can charge any combination of motion controllers and navigation controllers, which I was worried about as I use two motion controllers the most.
Overall great item and works very well. Amazon should try to sort out the mains plug problem though!