LIGHTWEIGHT & PORTABLE: Lightweight and compact design allows you to take the tennis trainer anywhere and start training at any time. This tennis training equipment can be used both indoors and outdoors, eliminating the need to pick up balls after each hit. SOLO TRAINING: Ideal for solo practice, this tennis trainer enables you to train independently. Improve hand-eye coordination and endurance with consistent, uninterrupted play. WATER INLET & OUTLET: Equipped with a convenient water inlet and outlet connector for easy filling and draining. Simplifies the process of adding or removing water or sand for weight. Anti-slip pads on the base enhance stability during use. 3 REPLACEMENT BALLS: Includes three durable, high-quality wool-covered training balls connected with high-elasticity rubber bands. Designed for long-term use and consistent rebound performance. EASY TO SET UP: Simply open the top valve and fill the base with water or sand to add stability. Attach the elastic cord and ball, then begin hitting. The ball automatically returns after each strike. Suitable for children, adults, and beginners. Product includes: 1 x Trainer base 3 x Training balls Features: - Tangle-resistant, durable cord - Anti-slip base - Water inlet and outlet for easy weighting Instructions: 1. Fill the base with water or sand. 2. Secure the ball to the elastic cord. 3. Hit the ball slightly upward to ensure smooth rebound and prevent ground contact. Enjoy effective training sessions!