All, FYI I own one of these and love it. I had to return the first one because it started getting glitchy and running very hot. I believe this was due to an improperly paired SD card. Like many, I thought getting the best SD card was ideal (Samsung Pro Class 10 64GB), but in actuality, higher quality cards make the camera run hotter. There is a group who tested all SD cards and ranked them for best performance.
Here is the link: http://blackvueshop.co.uk/forum/viewtopic.php?pid=721
So don't waste your money and damage your camera. Get the right card from the beginning. The blackvue cards are really good also but typically cost more.
AlanWIt comes with whatever size you buy it with. Usually the blackview brand which is matched very good. Most people try to save money by purchasing a 16GB camera and changing out to a 64GB card they purchase separately for less money. I was only providing a link to see which cards are good or bad for this specific camera if you go this route. So it saves you money.
Here is the link: http://blackvueshop.co.uk/forum/viewtopic.php?pid=721 So don't waste your money and damage your camera. Get the right card from the beginning. The blackvue cards are really good also but typically cost more.