Enables delayed rectifier potassium channel activity; protein heterodimerization activity; and transmembrane transporter binding activity. Involved in potassium ion transmembrane transport and protein localization to plasma membrane. Located in dendrite and neuronal cell body membrane. Part of voltage-gated potassium channel complex. Orthologous to human KCNB2 (potassium voltage-gated channel subfamily B member 2). [provided by Alliance of Genome Resources, Apr 2022]