CTYRZCH 5 PCS KY-040 Rotary Encoder Module Brick Sensor Development For Arduino TE173 Material: Electronic components + PCB 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 count, this rotation counts are not limited With the buttons on the rotary encoder can be reset to its initial state, that starts counting from 0 Working voltage: 5V