Enables voltage-gated potassium channel activity. Involved in potassium ion transmembrane transport. Located in several cellular components, including asymmetric synapse; cell surface; and dendrite. Is integral component of plasma membrane. Part of voltage-gated potassium channel complex. Is active in glutamatergic synapse. Is integral component of postsynaptic membrane and integral component of presynaptic membrane. Orthologous to human KCNA4 (potassium voltage-gated channel subfamily A member 4). [provided by Alliance of Genome Resources, Apr 2022]