Heavy Duty Extension Cord: 15ft Outdoor extension cord, 12 Gauge with 3 pure copper wire conductors, 15 Amp, 125 Volt, 1875 Watt, 5-15P/R, Temperature Range: -40°F to +130°F, SJTW cord, UL Listed. Durable Extension Cord: Our heavy-duty power cords are made of SJTW thermoplastic which is suitable for temperatures from -40°F to 130°F. Flexible vinyl covering protects cords against moisture, abrasion and sunlight and is resistant to extreme temperature which will not crack or deteriorate. Reinforced blades protect prongs from bending or breaking. Our double jacketed cords won't damage walls or floor and could stand up to concrete!