Potentiometer Kit, Color Black/Clear, Compatible with Brand Optrel, Compatible with Manufacturer Model Number 1006.210, 1006.300, 1006.500, 1006.501, 1006.502, 1006.600, 1006.900, 1006.901, Compatible with Series Sphere Series Helmet, Features Sphere Series Helmet, For Use With Crystal 2.0, e650, e670, e684, Optrel Sphere Series Helmets, Vegaview 2.5, Includes (1) Potentiometer Knob Black, (1) Battery Cover, (1) Sensitivity Knob, (1) Silicone Grind Cap