Enables calcium ion binding activity. Involved in insulin receptor signaling pathway via phosphatidylinositol 3-kinase; positive regulation of glucose transmembrane transport; and positive regulation of vesicle fusion. Acts upstream of or within positive regulation of glucose import; protein localization to plasma membrane; and vesicle fusion. Located in plasma membrane. Orthologous to human C2CD5 (C2 calcium dependent domain containing 5). [provided by Alliance of Genome Resources, Apr 2022]