Check the listing for details. 5Pc EC11 7 Pins 15mm Shaft Code Switch Potentiometer Rotary Encoder. Condition: New. Listed at 16.73 USD. Description:Type: Encoder code with Switch; Adjustment method: 360 Degree; Number of pulses: 20; Pin Numbers: 7(5 working signal pins & 2 mounting pins); Rated Voltage: 5 Volt.Shaft Diameter: 6mm/0.24"; Shaft Height: 15mm/0.59"; Thread Diameter: 6.8mm/0.27"; Total Dimension: 15mm x 12.5mm x 30mm / 0.59" x 0.49" x 1.18"(L*W*H).In the forward rotation, the A line phase leads the B line phase; when reversed, the B line phase leads the A line phase. The phase relationship and number of rotations of AB can be identified using a simple digital logic circuit (exclusive OR gate and D flip-flop).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.