Blocks voltage-gated potassium channels Kv1.1/KCNA1 (IC(50)=145 nM), Kv1.2/KCNA2 (IC(50)=2.5 nM), and Kv1.3/KCNA3 (IC(50)=15). Also inhibits calcium-activated potassium channels (KCa/KCNN). 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 09 subfamily.