Enables beta-3 adrenergic receptor binding activity. Involved in positive regulation of cold-induced thermogenesis. Acts upstream of or within several processes, including brown fat cell differentiation; diet induced thermogenesis; and norepinephrine-epinephrine-mediated vasodilation involved in regulation of systemic arterial blood pressure. Located in membrane. Is expressed in central nervous system; early conceptus; oocyte; and retina. Human ortholog(s) of this gene implicated in several diseases, including artery disease (multiple); arthritis (multiple); dilated cardiomyopathy 1H; obesity; and type 2 diabetes mellitus. Orthologous to human ADRB3 (adrenoceptor beta 3). [provided by Alliance of Genome Resources, Apr 2022]