Enables delayed rectifier potassium channel activity; transmembrane transporter binding activity; and voltage-gated ion channel activity involved in regulation of presynaptic membrane potential. Involved in several processes, including brain development; positive regulation of voltage-gated potassium channel activity; and response to auditory stimulus. Located in several cellular components, including dendrite; neuron projection membrane; and neuronal cell body membrane. Part of voltage-gated potassium channel complex. Is active in calyx of Held. Is integral component of postsynaptic membrane and integral component of presynaptic membrane. Human ortholog(s) of this gene implicated in progressive myoclonus epilepsy 7. Orthologous to human KCNC1 (potassium voltage-gated channel subfamily C member 1). [provided by Alliance of Genome Resources, Apr 2022]