The practicality to install the additional LED lighting in home supplies is the design consideration of the bright emergency light and flashlight power socket. And the convenient usage, versatile function and restricted size are the design focus. Therefore, the extension cord is considered as the design subject. The extension cord not only is an essential item at home but also has the function of power supply. So that it can be served as the LED power. Extension cord has high practicality as well as the condition of installing extra LED. It is quite suitable for the combination and innovation in LED applications.