Designed with latch and push button function, comes with nuts and washers, perfect for Arduino Mini controller use. By rotating, the rotary encoder can be counted in the positive direction and the reverse direction during the rotation of the output pulse frequency, unlike the rotary potentiometer counter, whose rotation number is not limited. Operating Voltage: 5V Pulse Circle: 20 Size: 26 x 19 x 29 mm Thread Diameter: 7 mm Thread Pitch: 7mm/0.27 inch Diameter: 15 mm Height: 16.5 mm How it works: The incremental encoder is a displacement of the rotating pulse signal converted into a series of digital rotating sensors. Material: PCB Color: black Package Contents: 3 x Rotary Encoder Module Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be a little different from the real one. The measurement allowed error is +/- 1-3cm.