Enables cannabinoid receptor activity. Involved in several processes, including positive regulation of acute inflammatory response; regulation of secretion by cell; and response to alkaloid. Located in membrane raft and plasma membrane. Colocalizes with intracellular membrane-bounded organelle. Used to study several diseases, including Parkinsonism; diabetic neuropathy; impotence; obesity; and peptic ulcer disease. Biomarker of status epilepticus. Human ortholog(s) of this gene implicated in obesity; schizophrenia; and type 2 diabetes mellitus. Orthologous to human CNR1 (cannabinoid receptor 1). [provided by Alliance of Genome Resources, Apr 2022]