Marine Shore Power Adapter: 30Amp L5-30P to 20/15Amp 5-15R 5-20R plug. Converts a 3 prong locking power connector to a household regular straight blade connector. Electrical rating: 20 Amp, 125 Volts, 2500 Watts. L5-30 Male Plug: compatible with NEMA L5-30P 30 Amp 125V locking 3 prong RV male plug; 3 prong locking plug commonly found on RV, generators and marine shore power. Household T-blade Outlet: compatible with NEMA 5-15R / NEMA 5-20R, 15/20Amp, 3-prong regular household T-blade female connector; Great for connecting to shore power at marinas to power boats and onboard electronics. Use scenarios: powering boat cabin devices at the marina, supplying 120V for onboard electronics, or linking a generator to shore power at RV sites. Cable Built to Last: designed with durability in mind, our marine shore power adapter cord boasts a molded plug, copper wiring coating, flame retardant and UV resistant materials; Its 3 conductor 10AWG construction, coupled with an indoor or outdoor water resistant jacket, effectively prevents surface oxidation; This makes it the ideal choice for outdoor usage.