50', 12/3 SJTW, Blue, Pro Lock Extension Cord, 58 Degrees Fahrenheit, -50 Degrees Celsius, Special Cold Weather PVC Jacket Guarantees Flexibility In Temperatures Well Below Freezing, Molded On Pro Lock Connectors Will Not Pull Away From The Cord Body & Offer Extra Water Resistance, High Impact Polycarbonate On Both Housing & Collar On Our Pro Locks To Guarantee Hard Service, Extra Heavy Duty Use, Fully Safety Compliant & Its Patented CGM Connector Features A Continuous Green Ground Check Light That Lets You Know The Cords Electrical Current Is Safely Grounded.