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The Optrel 5003.500 replacement control knob kit fits all expert series helmets (E684, Panoramaxx, Crystal, and Sphere). Kit includes a battery cover, ADF control panel, grind button, and silicone grind button
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We currently ship within the US, with more countries coming soon.
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🇺🇸 Ship from USA · On Agora since 2026
$13.99