Inhibits voltage-gated potassium channels (Kv1.2/KCNA2) and facilitates acetylcholine release at the avian neuromuscular junction (PubMed:9298966). Inhibits Kv1.1/KCNA1 and Kv1.3/KCNA3 with high potency (By similarity). Belongs to the sea anemone type 1 potassium channel toxin family. Type 1a subfamily.