NADPH oxidase which constitutively produces superoxide upon formation of a complex with CYBA/p22phox. Plays a role in the biogenesis of otoconia/otolith, which are crystalline structures of the inner ear involved in the perception of gravity (By similarity). Activated by the ototoxic drug cisplatin. Activated by NOXO1. Cooperatively activated by NCF1 and NCF2 or NOXA1 in a phorbol 12-myristate 13-acetate (PMA)-dependent manner. Inhibited by diphenyleneiodonium chloride (By similarity). Interacts with and stabilizes CYBA/p22phox. Expressed in the inner ear by the spiral glanglia and the organ of Corti.