Inhibitor of voltage-gated potassium channels of the Kv4/KCND family (By similarity). Blocks calcium channels (Cav). Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Belongs to the neurotoxin 10 (Hwtx-1) family. 19 (HpTX2) subfamily.