Weakly inhibits Kv1.2/KCNA2, Kv1.3/KCNA3, Kv2.1/KCNB1 voltage-gated potassium channels, and Nav1.5/SCN5A voltage-gated sodium channels (PubMed:29483648). Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Belongs to the neurotoxin 14 (magi-1) family. 01 (HNTX-16) subfamily.