Blocks calcium-activated potassium channels (Kd=43 nM on KCa1.1/KCNMA1). Has a potent presynaptic facilitatory action, with less effect on direct muscle stimulation. 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 01 subfamily.