Possesses sodium/calcium exchanger (NCX) activity when expressed in a heterologous mammalian CHO-K1 cell system (PubMed:23148213). Does not possess cation/proton exchanger (CAX) or sodium/proton (NHX) activity when expressed in a heterologous yeast cell system. Has the ability to bind calcium in vitro. Participates in the maintenance of calcium homeostasis (PubMed:23148213, PubMed:26296956). May play a role in auxin response, diurnal rhythm and flowering time (PubMed:26296956). Involved in salt stress response (PubMed:23148213). Expressed in roots, leaves, stems, petals, stamens, ovules and siliques. Induced by salt stress (PubMed:23148213, PubMed:26296956). Induced by cold stress, heat shock and abscisic acid (ABA) (PubMed:23148213). Induced by calcium and magnesium chloride, and osmotic shock (PubMed:26296956). No visible phenotype under normal growth conditions (PubMed:23148213). No visible phenotype under short day (SD) conditions, but early flowering under long day (LD) conditions (PubMed:26296956). Belongs to the Ca(2+):cation antiporter (CaCA) (TC 2.A.19) family.