User-Friendly Design: Weighing 48 lbs (21.8 kg), this automatic portable tennis ball launcher is compact and lightweight, easily fitting into the trunk of a car for convenient transportation. It features a retractable handle and wheels for easy portability and mobility. Long Battery Life: This tennis training machine uses a high-quality external lithium battery, providing 2 hours of battery life. It is recommended to fully charge the battery before each use, with each charging session lasting 6-8 hours. Ease of Use: The portable tennis ball machine comes with a built-in Bluetooth 4.0 module and a self-developed app (30m connection distance), allowing you to easily adjust parameters. The app offers full control over ball speed, frequency, and angle, making it convenient to adjust ball trajectories. Automatic Ball Placement Control: This large capacity tennis ball thrower offers 5 major serving modes and 29 different ball trajectories, allowing you to customize 1-20 placement points. It can automatically oscillate both horizontally and vertically, adjusting topspin and backspin for multi-mode simulation training, making it ideal for various tennis scenarios. Professional Tennis Ball Machine: This tennis ball machine features an all-metal body, ensuring durability and resistance to wear over long-term use. It has a maximum ball speed of 125 km/h and a ball capacity of 150 tennis balls, making it suitable for both beginners and professional players.