Comprehensive Training Partner: With a maximum ball speed of 125 km/h, this large capacity tennis ball thrower is suitable for both beginners and professional players. It can hold up to 150 tennis balls, meeting the long-term training needs of players of all levels, making it your portable tennis training partner. 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. Professional Tennis Ball Machine: This tennis ball machine features an all-metal body, ensuring durability and resistance to wear over long-term use. It can oscillate both horizontally and vertically, and randomly directs balls. It allows for topspin and backspin adjustments, offering multi-mode simulation training for various tennis scenarios.