This is an incremental rotary encoder that encodes the rotation by electronic pulse, each outputs encodes clockwise and counterclockwise with 20 pulses per circle. Unlike rotary potentiometer count, this rotation counts are not limited, and the outputs are digital. it can be also pressed, to generate another “knob” signal for your projects. When you need to add a rotary knob to your project, for example a volume knob for a speaker, a selection panel or a digital input, this will be your first choice.