PRACTICAL DESIGN: Two parallel 16/2 extension cords extend from one end, each with 10 feet and 3 outlets, totaling 20 feet and 6 outlets. It has passed UL certification and performs well for indoor household, meeting the needs of electrical appliances such as Christmas lights. EXCELLENT PRODUCT PERFORMANCE: Made of copper and thick vinyl sheath that meets international standards, it has low resistance, low power transmission loss, moisture resistance, wear resistance, flame retardancy, and slip resistance. Safe and durable, and has good flexibility for easy storage.