Switch/Lampholder: 125 Vac (250w Max). Receptacle: 125 Vac (660w Max). Add more outlets! UL Listed. Adds two convenient outlets to a standard (medium base) bulb socket. On/off pull chain operates bulb socket only. Ideal for workshop, garage, and utility room. 70AG Lampholder, adapter. This is a polarized device. It has polarized outlets (one slot is longer than the other). The polarized plug is not intended to be used with nonpolarized outlets (where both slots are the same size). A polarized outlet is intended to fit with a polarized plug in only one way- the longer slot with the wider blade.