It's a Machwheel MR-1. I found it on Amazon, it was the only $300 board with a dual motor so I tried it. It's actually quite good for the price, but I recommend opening the battery and putting in a new BMS as soon as you get it. The one that comes with the board does not balance the cells... It's actually quite easy to do, and BMS's are really cheap.

Here's the link, but it's currently unavailable: https://www.amazon.com/gp/aw/d/B07T7M4BMK/ref=cm_cr_arp_mb_bdcrb_top?ie=UTF8