Check the listing for details. 360° Rotary Encoder Module KY-040 Brick Sensor Clickable Switch Arduino ARM PIC. Condition: New. Listed at 3.09 USD. Working voltage: 5V Pulse circle: 20 Material: electronic components + PCB Size: 26 x 19 x 29mm/1.02 x 0.75 x 1.14inch Diameter of the thread: 7mm/0.27inch Height of the thread: 7mm/0.27inch Knob Cap: Diameter: 15mm/0.59inch Height: 16.5mm/0.65inch Connection: "GND”: ground terminal "+”: 5V power supply "SW”: Select switch (activated when shaft pressed on top) "DT”: Encoder Pin B "CLK”: Encoder Pin A Designed with detent and push button switch feature, comes with nuts and washers, ideal for Arduino micro controller use. By rotating the rotary encoder can be counted in the positive direction and the reverse direction during rotation of the output pulse frequency, unlike rotary potentiometer counter, which species rotation counts are not limited. How it works: incremental encoder is a displacement of the rotary pulse signal is converted to a series of digital rotary sensors.