When the lamp needs to move, only a screw bulb is needed, where the socket can be plugged in to light up, with an independent switch. It can be used for night lights and corridor lights.1 E27 screw mouth, suitable for all kinds of LED lamp energy-saving Fully adjustable heads rotate 360 angles to 90 degree. Easy plug-in installation，On off button. For use with standard E26 E27 edison lamp base household bulb 100-220V 100 W E26/E27 screw mouth, suitable for all kinds of LED lamp energy-saving lamps. Packing includes 2 x Plug in Light Socket and 90-days free-replacement or money back warranty.