Enables voltage-gated sodium channel activity. Involved in nervous system development and response to pyrethroid. Predicted to be part of voltage-gated sodium channel complex. Predicted to be active in plasma membrane. Used to study visual epilepsy. Biomarker of otitis media. Human ortholog(s) of this gene implicated in familial atrial fibrillation. Orthologous to human SCN2B (sodium voltage-gated channel beta subunit 2). [provided by Alliance of Genome Resources, Apr 2022]