INTERACTIVE DOG TOYS:Dogs love to fetch,with the dog ball thrower,your dog will be able to play its favorite game even when you are not home. PERFECT DOG GAMES: The automatic dog ball launcher functions as perfect dogs throwing toy, which can not only train your pet's patience and consistency but also can develop the dog's intelligence. ADJUSTABLE DISTANCE: Tennis ball launcher for dogs can throw balls to 3 different distance.Choose from three different preset launch angles to set the perfect throwing distance for your surroundings. Package includes 3pcs 2.5 non-abrasive felt dog tennis balls,won t wear down your dog s teeth and is easy to clean.Air-Hollow Core makes dog balls longer shelf life. Make sure to let your dog take breaks from the tennis ball machine every 15-20 minutes.Fetching can be exhausting,and sometime dogs love it that much that they do not know when to stop.