Don't be left in the dark! With the HS9612, you'll have light, even if the power goes out. When the power goes OFF this night light stays ON! Highly recommended for areas where power failures are frequent, our Power Failure Night Light is actually two products in one - a regular night light and a safety light if you lose power. Using three AAA alkaline batteries (not included), it can provide more than four days of emergency light. Plus the LED eliminates the need for bulb replacement. The regular night light operates for pennies a year.