2. positive reverse port connection method to connect 5V a direction to the direction of GND 3. Singnal speed pulse output port output of a circle of pulse = motor pole number x 3 1. VR speed control port connection method can be controlled by voltage regulation control or PWM control speed voltage regulation can be adjusted by the adjustable resistance (20K 3 pin bit VR port side of the port side of the 5V port to connect to the GND port through the regulation of voltage control) 4. 5V control terminal 5V voltage output port., Weight: 0.06503636729 Pounds, Manufacturer: susaa