Enables calmodulin binding activity and small conductance calcium-activated potassium channel activity. Involved in positive regulation of potassium ion transport; potassium ion transport; and regulation of neuronal synaptic plasticity. Located in dendritic spine and neuronal cell body. Is integral component of membrane. Used to study essential tremor. Orthologous to human KCNN2 (potassium calcium-activated channel subfamily N member 2). [provided by Alliance of Genome Resources, Apr 2022]