The Laser Pet Toys emit a red laser beam that dogs and cats will chase for hours, which is great for exercise and entertainment. Laser beam is visible for up to 1 mile. Each toy contains 3 batteries. The Laser Pet Toy and Exerciser features 5 different holograms of a smiley face, mouse, star, ball and butterfly that can be switched by simply rotating the lens. The 2 in 1 Laser toy features a regular red laser beam along with a powerful LED flashlight for nighttime walks.