Rotary encoder module, without nut

Model: KY-040A.
The KY-040A rotary encoder module is an input device that is controlled by a rotary switch that has a fixed amount positions per revolution which are felt as the knob is turned in either direction through small position clicks. A good module for controlling stepper and servo motors. Does not have attachement nut, like the KY-040.

Specifications:
Operational voltage: 5V
Positions in full rotation: 20