Dual Certification: UL Listed and ETL Listed. Meeting the highest security certification in the United States. Every thread has been subjected to a high pressure needling test. Buy with confidence Heavy Duty: 100% oxygen-free copper, thickened PVC, waterproof, low & high temperature resistant, flexible, folding resistant Outdoor & Indoor: Suitable for shed, outdoor lights, timers, Christmas decorations, bedroom, kitchen, gaming room, server room, home or office use. Perfect for Uninterruptible Power Supply (UPS) Specifications: Standard 3 Prong plug, 16AWG pure copper core, SJTW, 3C, FT2, 13Amp, 125V-300V(MAX) Dynamic Use: When your appliance plug cannot reach the socket, use an extension cord to reach it easily. Either have an extended cable for a variety of appliances, or keep it in your toolbox for backup