Material: The table tennis ball machine is made of high-quality ABS material, sturdy and durable, simple and easy to learn, and suitable for all kinds of people. The 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 point serving, no rotation. Serving frequency: about 15 serves per minute, and the serving machine sends a ball every 4-6 seconds. Two power supply methods: USB plug for use or 4 AA batteries for power supply (batteries are not included), suitable for indoor and outdoor use. Specification: Material: ABS Size: Diameter 15cm/5.91in, Height 30.5cm/12.01in Package includes: 1 Table Tennis Ball Machine 1 USB Cable Note: Please allow slight errors due to manual measurement and different displays.