This AC WORKS brand 50ft RV/Marine adapter cord is very durable. It is a NEMA L14-30P to NEMA SS2-50R. The L14-30P is a 30 Amp, 125/250 Volt, 4-prong locking male plug. The SS2-50R is a 50 Amp, 125/250 Volt, 4-wire female connector. This product features an STW 10/4, 600 Volt jacket, 30 Amp Copper wires, and an anti-cold weather Rubber cord that will stay flexible in extreme temperatures. The maximum operational power is 7500 Watts.