Enables small conductance calcium-activated potassium channel activity. Involved in potassium ion transport. Located in several cellular components, including filopodium; neuromuscular junction; and neuronal cell body. Human ortholog(s) of this gene implicated in paranoid schizophrenia and schizophrenia. Orthologous to human KCNN3 (potassium calcium-activated channel subfamily N member 3). [provided by Alliance of Genome Resources, Apr 2022]