USB Table Tennis Robot Pong Ball Launcher Exercise for Description: Material: The table tennis ball is made of high quality ABS material, strong and durable, simple and easy to learn and suitable for all kinds of people. Number of balls that can be loaded: 15 balls for normal use (table tennis balls are not included in the package). Ball drop angle: fixed servo, no rotation. Serving frequency: about 15 servings per minute, and the serving machine sends the ball every 4-6 seconds. Two power supply methods: USB plug in use or 4 AA batteries for power supply (batteries not included), suitable for indoor and outdoor use. Specifications : _ Material: ABS Size: diameter 15 cm/5.91 inch, height 30.5 cm/12.01 inch The package includes: 1 Table Tennis Ball Machine 1 USB cable