Selectively and reversibly inhibits small conductance calcium-activated potassium channels (KCNN, SK). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Has no effect on sodium, calcium, Kv nor BK currents. Does not affect apamin binding (PubMed:15208029). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 14 subfamily.