This product is connected to the DROK® Handy DC3-21V 3.5A USB Adjustable Constant Current Electronic Load Portable 35W Power Aging & Discharging Electric Resistance Resistors for Mobile Power Pack Charger Testing on the Amazon Project page:
https://www.amazon.com/dp/B0194MY8XY/ref=twister_B01FHD53LK?_encoding=UTF8&psc=1
See the 5th image down.
I plan on purchase this item so I’m very curious as to what that product is connected to it. My guess it is a DC convertor but the image does not seem to match any of them so I thought it might be something else.
Hope that helps you identify it!