This AC WORKS brand extension cord [S520PR] is very durable. It comes in a length of 50ft, and has a NEMA 5-20P to NEMA 5-20R. The cable is an SJTW, 12/3, Indoor/Outdoor cord. The 20 Amp NEMA 5-20P is a straight-blade plug and the NEMA 5-15/20R is a straight T-blade connector with a power indicator on the end. This cable is anti-cold weather staying flexible in extreme temperatures. This product is UL listed and applicable to UL standards and requirements. Included with your purchase is a 5-year limited warranty.