One round number of pulse: 20<br> Working voltage: 5V<br> 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.<br> With the key on the rotary encoder, you can reset to the initial state, that is, counting from 0.<br> The Material of Knob Cap: aluminium alloy<br> The Specification of Knob Cap: diameter: 15mm/ 0.59in; height: 16.5mm/ 0.65in<br><br> <b>Package Includes:</b><br> 5× Rotary Encoder Module<br> 5× Potentiometer cap