Reversible blocker of both Kv1.3/KCNA3 potassium channels (high affinity) and Shaker B (mammalian Kv1.1 analog) potassium channels (very low affinity). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 18 subfamily. Lacks the dyad motif characteristic of alpha-KTx and generally associated with channel blockage.