Binds to sodium channels (Nav) and affects the channel activation process (By similarity). In mice, causes hyperactivity that persists until death. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Belongs to the long (3 C-C) scorpion toxin superfamily. Sodium channel inhibitor family. Beta subfamily.