The Franklin Pet Supply-Ready Set Fetch Mini Automatic Tennis Ball Launcher is the ultimate interactive pet toy! Your small dog will love the distance this unit will launch the ball, and your arm will love the automatic electronic functioning. This interactive dog toy keeps dogs coming back again and again. Once your dog places the 1.7 " mini sized tennis ball into the top of the feeder, the mini tennis ball feeds through the chamber and an optional warning sound will sound prior to launch for safety. The launcher warning buzzer can be turned on or off on command. This automatic launcher shoots the mini tennis balls up to 40' feet for long range fetch that dogs are sure to love. The launcher includes a power adapter that can plug into any outlet, plus it can also run on (4) "D" batteries (not included) so you can take the game on the go to the backyard or park. This launcher comes with (1) RSF mini tennis ball included so you can stary play time right out of the box. So if you're ready to give you dog the gift of endless fetch, grab your Franklin Pet Supply-Ready Set Fetch Mini Automatic Tennis Ball Launcher and start the games today!