Enables intracellular cAMP-activated cation channel activity and intracellular cGMP-activated cation channel activity. Involved in regulation of cytosolic calcium ion concentration. Located in plasma membrane and terminal bouton. Part of intracellular cyclic nucleotide activated cation channel complex. Human ortholog(s) of this gene implicated in retinitis pigmentosa and retinitis pigmentosa 45. Orthologous to human CNGB1 (cyclic nucleotide gated channel subunit beta 1). [provided by Alliance of Genome Resources, Apr 2022]