Enables calcium ion binding activity. Involved in several processes, including cochlea development; regulation of presynaptic cytosolic calcium ion concentration; and regulation of synaptic plasticity. Located in several cellular components, including cuticular plate; dendritic spine; and stereocilium. Is active in calyx of Held; postsynaptic cytosol; and presynaptic cytosol. Biomarker of bilirubin metabolic disorder. Orthologous to human CALB1 (calbindin 1). [provided by Alliance of Genome Resources, Apr 2022]