Check the listing for details. Portable Baseball/Softball Swing Trainer with Auto Reset Tethered Ball. Condition: New. Listed at 38.70 USD. Product Description： Real-Time Feedback: The trainer offers real-time batting practice feedback based on the angle, speed and rotation times after each hit. You can adjust your swing posture and strength in time based on the feedback to achieve better training results quickly. Instant Automatic Reset: The swing trainer features a tethered ball that automatically resets after each hit, eliminating the need to chase balls. Enjoy smooth, repeatable practice to maximize your training time and focus. Durable Metal Construction: Made of high-quality metal, this trainer features a 4mm-thick metal frame designed to withstand high-impact forces. Easy To Set Up: This softball/baseball swing trainer features an easy-to-install design and mounts easily to any chain-link fence.