Batteries sold separately. Uses 3 AAA alkaline batteries (LR03 AAA 1.5V). Light bulb cannot be replaced. Embedded LED. Pyroelectric infrared sensor that lights up when a person approaches. I'm decluttering. I bought this, barely used it, and it's been sitting in a drawer. Hoping someone can make use of it. ☆ Please consider this a used item and understand it has been stored by a private individual. ☆ Please forgive any oversight of scratches, as I am a private individual inspecting the item. ☆ Packaging materials may be recycled instead of new.