This is a heavy duty 40 Feet (12.2 m) generator extension cord. It is ETL listed and great for outdoor use. This cord has been designed tough and made from the highest quality materials to be oil, water, and corrosion resistant. The comfortable design is easy to use and allows for easy removal. The cord is designed to maximize flexibility. SJTW 10AWG/4C 30A 125/250V 60Hz. 4-Prong.