Ensure your electrical equipment is properly grounded to keep your high-profile, hazardous jobsite safe. This 100 ft. 12/3 sjtw cgm extension cord features a green ground check light so you know the cord"s electrical current is safely grounded, and an amber power check light on the plug that indicates power delivery through the cord. With a cold-weather jacket rated at -40°f, you can trust this extension cord to stand up to temperatures below freezing.