Enables IgA binding activity; IgM binding activity; and transmembrane signaling receptor activity. Predicted to act upstream of or within immune response. Predicted to be located in membrane. Predicted to be integral component of membrane. Predicted to be active in plasma membrane. Is expressed in brain; cerebellum; and spinal cord. Orthologous to human FCAMR (Fc fragment of IgA and IgM receptor). [provided by Alliance of Genome Resources, Apr 2022]