Enables MHC class I protein binding activity. Involved in negative regulation of osteoclast differentiation. Acts upstream of or within myeloid dendritic cell activation. Located in plasma membrane. Orthologous to human PILRA (paired immunoglobin like type 2 receptor alpha) and PILRB (paired immunoglobin like type 2 receptor beta). [provided by Alliance of Genome Resources, Apr 2022]