【3 to 4 Prong Dryer Cord Adapter 】：Dryer adapter can connects the 3-prong plug of your dryer to the 4-slot outlet in your house. Nema 14-30 plug connect to the wall outlet. 【LED Power Indicator and Twist Locking Design】: LED power indicator light of adapter cord visually informs the user when the generator cord is connected to the power source.