Generic 36v 800watt brushed motor controller. Just like one of these:

https://www.amazon.com/Wingsmoto-Controller-Electrical-Scooter-Bicycle/dp/B074TDNXXD/ref=sr_1_2?crid=ROSDQ1N4BJQW&keywords=36v+brushed+motor+controller&qid=1686831345&sprefix=36v+brushed+motor+controller%2Caps%2C145&sr=8-2

Resistance reads 0.5 ohm