One of the better controller kits I've found on AliExpress. Universal works on any low to mid power applications. Auto learns, 36v 48v or 60v at around 33amps. comes with display, key switch, and throttle. I like that it has 5 different speed setting and is really easy to setup. Most of the controllers I get from China have poor or no instructions. This one has good instruction all wires labeled.