Inhibits with low potency Kv1.2/KCNA2 and Kv1.3/KCNA3 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. 17 subfamily.