For use when your 30A extension cord (with L5-30 plug) into NEMA 5-15 outlet to get power. NEMA 5-15P to L5-30R 125V/1875W. Household regular 15 AMP male Plug (NEMA 5-15 Plug). Shore Power twist lock 30 AMP female receptacle with locking ring (NEMA L5-30 Marine Style) Molded with electroplate copper terminal in order to avoid surface oxidation effectively. Length: 5 Meters. Color: Yellow