30A Pure Copper Cable: Current: 30AMP, Voltage: 125/250V, Power: 7500W. The extension cord is pure copper wires. It has a 10/4 (10 gauge 4 wires) cable, which is heavy-duty but flexible enough to be managed..20FT Power Cord: Secure extend your power up to 20ft away. It could be combined with your existing power cords and adapters, avoiding you and others from hazardous generator exhaust. The plastic strap makes the cord neat when not in use..Twist Locking Design: Uses 4 prong twist lock L14-30P to L14-30R plug for emergency generators. Compared to other ordinary plug designs, our locked plug is not easy to fall off due to external factors such as a hurricane, heavy rain, heavy snow..Portable Strap: The plastic strap makes the cord neat when not in use. This generator wire is perfect for emergency generator connection to help power the entire home, office, shop, etc..Wide Application: This cord enables an easier reach from your generator to your nearest power receptacle or electrical connection. So you can use secure electricity when you are home, working, or outdoor traveling.