This AC WORKS brand plug adapter S515520-012 is very durable. It is 1 foot in length and is a NEMA 5-15P to NEMA 5-15/20R. The NEMA 5-15P is a 15 Amp, 125 Volt regular household male plug. The NEMA 5-15/20R is a 20 Amp, 125 Volt, T-blade female connector. The cable is an SJTW, 12/3, Indoor/Outdoor jacket with a 20 Amp rated cable.