Enables A-type (transient outward) potassium channel activity and voltage-gated ion channel activity involved in regulation of postsynaptic membrane potential. Involved in several processes, including locomotor rhythm; neuronal action potential; and potassium ion transmembrane transport. Acts upstream of or within action potential. Located in several cellular components, including GABA-ergic synapse; dendritic spine; and postsynaptic membrane. Is integral component of postsynaptic membrane. Part of voltage-gated potassium channel complex. Is active in glutamatergic synapse. Is integral component of postsynaptic specialization membrane. Is expressed in several structures, including heart; hindlimb digit; metanephros; nervous system; and sensory organ. Orthologous to human KCND2 (potassium voltage-gated channel subfamily D member 2). [provided by Alliance of Genome Resources, Apr 2022]