Rock A Long Christmas tree low batteries

This thing goes off randomly by itself, in the middle of the night or whenever, not sure what causes it as its not suppose to do that it's only motion activated when its turned on, but it's in the part of the room where theres no light and the sensor is blocked, and it still just randomly goes off whenever which eventually caused the batteries to go low which makes it even weirder now because it's so distorted now which adds to the affect.