Enables potassium channel regulator activity. Involved in protein localization to plasma membrane and regulation of potassium ion transmembrane transport. Located in several cellular components, including cytosol; dendrite; and neuronal cell body. Part of voltage-gated potassium channel complex. Orthologous to human KCNIP4 (potassium voltage-gated channel interacting protein 4). [provided by Alliance of Genome Resources, Apr 2022]