Probable ion channel required for the normal function of hair cells (By similarity). Component of the hair cell's mechanotransduction (MET) machinery (PubMed:25114259). Interacts specifically with isoform CD3 of PCDH15A (via cytoplasmic domain). Localized to the hair bundles of the hair cells. In adults, expression is restricted to the hair cells of inner ear and lateral line organ. Expressed at higher levels in the larval lateral-line neuromasts than in the larval inner ear. Expressed in the sensory hair cell patches of the ear at 4 days post fertilization (dpf). Belongs to the TMC family.