Enables identical protein binding activity. Acts upstream of or within auditory receptor cell stereocilium organization; detection of mechanical stimulus involved in sensory perception of sound; and establishment of protein localization. Located in stereocilia ankle link and stereocilium. Part of USH2 complex and stereocilia ankle link complex. Human ortholog(s) of this gene implicated in Usher syndrome type 2A; Usher syndrome type 2C; and autosomal recessive nonsyndromic deafness 57. Orthologous to human PDZD7 (PDZ domain containing 7). [provided by Alliance of Genome Resources, Apr 2022]