Reversibly blocks voltage-gated potassium channels Kv1.2/KCNA2 and Kv1.3/KCNA3. Expressed by the venom gland. Contains 2 disulfide bonds. Does not inhibit voltage-gated potassium channels Shaker B, Shab, Kv1.1/KCNA1 and Kv1.4/KCNA4. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Gamma-KTx 2 subfamily.