Your dog will have a ball with the PetSafe Automatic Ball Launcher Dog Toy. Designed to provide an automatic, interactive game of fetch, the ball launcher will keep your best friend engaged and give your arm a little break. Water resistant and perfect for backyard playtime or sprints down the hallway, the PetSafe Automatic Ball Launcher Dog Toy comes with 2 tennis balls and can hold up to 3 at a time. You can adjust how far the ball is thrown with multiple distances and angle settings depending on where your dog plays his next game of fetch. This ball thrower for dogs has built-in safety features to keep your best friend safe during playtime. The toy is designed with electronic motion sensors which detect if your pet is within 2 meters of the dog ball launcher hole, and wont launch a ball until your dog moves further away or to the side out of view of the motion sensor. It also uses an audible tone to signal when a ball is about to be thrown, so your dog is always ready to run and fetch. To keep your high-energy dog from becoming overworked, the PetSafe Automatic Ball Launcher Dog Toy will enter an automatic sleep mode after 30 minutes of playtime to give your dog 15-minutes to rest. The launcher works with either an included power adaptor or 6 D-Cell batteries (not included). The PetSafe Automatic Ball Launcher Dog Toy throws ball for you, allowing you to sit back, relax and let your dog play fetch independently.