Requires 3 AA batteries (not included), for best performance, we suggest using alkaline batteries. It is ideal for pet owners to play with cats! Please be free to contact us if you have any other question about it. Flashing Butterfly: It can swing & reflect in the dark space because of the special flash butterfly arms design. If you are worried about that your cat are bored when you turn off the light, the butterfly toy is a perfect way to solve it!. Lifelike Movement: The butterfly will keep rotating and fluttering after 360 degree rotating of the pole. Exhibiting the most realistic butterfly flying status. Stimulating cat’s hunting instinct. 360° Self Spinning Toys: Equipped with an electric engine to rotate the Butterfly toy in a clockwise way to engage your cat to play, increg to their curiosity and excitement. Motion Activated Butterfly Toy: This electric cat toy will rotate(for 30 seconds) only when cat is approaching, which is more energy saving. The sensor's linear distance is 39 inch.