The Annin Robotics AR2 is an open source low cost robot. Here is the youtube video show how to build a AR2 robot by yourself OPEN SOURCE LOW COST ROBOTS
1 x Nema 17 Stepper Motor L=39mm Gear Ratio 20:1 High..
Handheld Intelligent Setting Unit(HISU-DM), used to setting parameters for related drive products.
Two types of matched cable, differ in the end connected to driver, one with a crystal head and the other not.