Moderately inhibits Kv1.1/KCNA1 and Kv1.2/KCNA2 and weakly inhibits Kv1.3/KCNA3, and Kv2.1/KCNB1 voltage-gated potassium 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 hainantoxin family. 20 subfamily.