LIGHTWEIGHT & PORTABLE: Since they are light and compact, you can easily take the tennis trainer with you anywhere and start training at any time! With our tennis training equipment that you can use to play tennis indoors and outdoors, you no longer have to pick up the ball! SOLO TRAINING: Are you still worried that there are no tennis companions? Try this tennis trainer that is best for solo training. You can play tennis all by yourself without the crowd, and your hand-eye coordination and endurance can also improve significantly. WATER INLET & OUTLET: There is a connector designed for easy filling and draining of water, completely solving the problems of insufficient water loading, difficult water loading and difficult water pouring. In addition, the anti-slip pads underneath improve stability. 3 REPLACEMENT BALLS: The tennis trainer set contains three interchangeable balls that can be used for a long time. The balls made of high quality wool are super durable. Each ball has a high-speed elastic rubber band to give you a powerful punch. EASY TO SET UP: Simply pull out the top valve and fill the trainer with water or sand to add weight. Then wrap the elastic rope, finally hit the ball and it will automatically bounce back to you. Suitable for children and adults, even tennis beginners can start without any problems. Product s Tennis trainer with 3 rebound balls for solo training beginners for adult children Package includes: 1 x trainer base 3 x training balls Features: Anti-Tangle No-Breaking Cord Anti-slip skirting board Water inlet and outlet Steps: 1. Fill the tennis base with water or sand. 2. Tie the tennis ball to the base. 3. Hit the ball slightly upwards to prevent the ball from being pulled back onto the ground by the rope. Have fun training!