I got this pack of three wireless LED Motion Sensor lights to place in certain areas of my house. Simple to use, all you need is three AA batteries. The lights will be on when you first apply the batteries but then it turns off. The lights need to be in a dark area and when it senses movement then they turn on. I placed one in my closet since it's dark and the other two in my hallway. Great for those late nights when you need to get up for a snack or the restroom.