Cylewet 5Pcs KY-040 Rotary Encoder Module with 15×16.5 mm with Knob Cap for Arduino (Pack of 5) CYT1062 Description One round number of pulse: 20 Working voltage: 5V The rotary encoder can count the number of pulse output during rotation in the positive direction and reverse direction through the rotation and this rotation counts are not limited. With the key on the rotary encoder, you can reset to the initial state, that is, counting from 0. The Material of Knob Cap: aluminium alloy The Specification of Knob Cap: diameter: 15mm/ 0.59in; height: 16.5mm/ 0.65in Package Includes: 5× Rotary Encoder Module 5× Potentiometer cap Features: Working voltage: 5V; One round number of pulse: 20 The rotary encoder can count the number of pulse output during rotation in the positive direction and reverse direction through the rotation and this rotation counts are not limited With the key on the rotary encoder, you can reset to the initial state, that is, counting from 0 The Material of Knob Cap: aluminium alloy The Specification of Knob Cap: diameter: 15mm/ 0.59in; height: 16.5mm/ 0.65in Product Details: Package Dimensions: 4.96 x 4.25 x 1.02 inches Item Weight: 2.04 ounces Manufacturer: Qianxin Is Discontinued By Manufacturer: No Date First Available: March 19, 2017