EEL stands for Easily Engaged Lock, and just like a real eel, the EEL ShorePower clamps down and doesn't let go to create a safe shore power connection and watertight seal. Built-in cord light. LED power indicator light on both ends. Secondary lock for added security. Heavy-duty, super flexible marine grade cable (30 amp 10 gauge, 50 amp 6 gauge). Corrosion-resistant, nickel-plated contacts.