125V/4W Max. On at dusk, off at dawn. Cool-burning 4-watt bulb. Using a photoelectric sensor, this night light turns on automatically as daylight decreases, and off as daylight increases. Simply plug it in! Note: Bulb may flicker at certain light levels for a short period of time. This is a normal part of operation. This is a polarized device. It has a polarized plug (one blade is wider 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. UL Listed.