SUITABLE SIZE : size is 7in*2.36in*3in, very convenient to carry, not take up space, 3 x 5 batteries are required for use. Even when not at home, it can liberate your pet's nature and stimulate their pursuit and capture instincts. Dimly lit environments, soft music and lighting can also protect your eyes. (Note: batteries not supplied,buyers prepare their own) INTERACTIVE GAMES: Dogs have a natural affinity for fast-moving objects and are easily excited. This floating ball can help your dog exercise and maintain focus. Let dogs liberate their nature during play and reduce destructive impulses, such as attacking sofas and damaging cables. You can play with your family and pets, promoting communication and interaction between pets and their owners.