Each box contains 1 launcher and 3 tennis balls for endless fun. Please follow the instructions and always supervise your dog while playing.This ball launcher stimulates dog's minds by challenging them to learn something new, while strengthening the bond between dogs and their humans.Launches the ball 10, 20 or 30 feet, which can easily be changed with the push of a button. Great for indoor and outdoor use.Entertain your dog with The Automatic Ball Launcher. The automatic ball throwing machine is designed especially for small to medium dogs, it's a perfect toy for your dog to play even when you're away!Note:1. Due to many factors, such as the brightness of the display and the brightness of the bulb, the actual color of the product may differ from the image on the website.2. Measurement data may be slightly biased. Allow 1-3 cm error3. An ON/OFF power switch function is added to the bottom of the product. 4.It can be used by plugging in the power supply (not included) or using 6 knots C batteries (not included)