In the inner ear, may be a component of the hair cell's mechanotransduction machinery that functionally couples PCDH15 to the transduction channel. Regulates transducer channel conductance and is required for fast channel adaptation (By similarity). Found in a complex with TMIE and PCDH15. Interacts with PCDH15; this interaction is required for efficient localization to hair bundles. Interacts with TOMT. Efficient localization to the plasma membrane requires the presence of PCDH15. Belongs to the LHFP family.