iPong Expert Table Tennis Trainer Robot Simple table tennis robot for even-paced and consistent ball trajectory Modern sheer shell for visibility and new spiral gravity ball-feed mechanism Holds up to 25 balls and casts 30 balls per minute Compact 12 x 7 for easy travel; Simple on/off switch; Uses 4-AA batteries Compatible Accessories: 40mm and 40+ balls, iPong ball catch net, iPong ball pickup net, iPong tilt stand, iPong targets