FETCH-A-HOLICS REJOICE! Interactive, automatic tennis ball launcher lets big dogs play fetch to their hearts’ content. THE BIG DOG: This is our large automatic ball thrower. Launches a standard sized tennis ball 10, 25, or 40 feet all with the touch of a button. It even includes a “random” distance setting to keep your dog guessing. (See “iFetch” for small dogs.) RECHARGEABLE BATTERY: No batteries needed here… ever! Runs on a built-in, rechargeable battery, so just charge and go. STANDARD TENNIS BALLS: Comes with 3 non-abrasive, standard sized tennis balls, about 2.5” diameter. Use other similar sized balls too! Just try not to get them too dirty or wet – this will affect performance SAFETY: Lock the distance setting to 10 feet with a slide of a button. Makes it a cinch to use indoors or outdoors with your energetic pup.; CUSTOMER CARE: Created, owned, and still operated by the Hamill family in Austin, Texas. Call or email us directly with any questions or issues. We specialize in happy human and canine customers.