With Zipper Switch: This outlet light socket features a convenient pull chain that allows you to easily turn the power on or off, eliminating the need to turn off the main power every time you need to turn off the device, and this pull chain can control the light bulb on/off individually (does not control power to the sockets on either side). The length of the pull chain is 6.3''/16cm3-in-1 Function:This three-in-one light socket to plug adapter meets your multi-functional electrical needs. The expander design of the light bulb outlet socket adapter includes two three-pronged sockets and a bulb socket with a zipper control, Perfectly compatible with two-pronged and three-pronged plugs. It provides you with a more convenient way of using electricity.Easy to Install: before inserting the plug, please turn off the power supply of the lamp and remove the existing bulb; Screw the bulb plug adapter onto the lamp holder; Finally, you can insert 2 or 3 plugs as needed to turn on the switch.E26 socket : Power socket on both sides of the light socket adapter, the 3-prong design can both support 2 prongs and 3 prongs, which has wider application range than 2-prongs light socket to plug adapter, which providing you with a convenient way to power your appliances and electronic devices without the need for multiple outlets and that can provide a measure of safety.Widely UsedThe socket plug adapter has two three pronged sockets that can support both two pronged and three pronged plugs. When you don't have extra sockets to use, Just screw the light plug adapter into the bulb socket to use. It can be widely used in offices, Basements, Attics, Balconies, Surveillance camera, Doells. with a zipper switch lamp holder, Providing convenient and quick power supply for party, Christmas and halloween decoration lights.