Features: 1. The magic ball is made of high-quality material, wear-resistant, not easy to break, reusable and durable. 2. Reduce Separation Anxiety: Rollerball is designed to keep your pet busy, reducing stress when you are away. It's ideal for when you're at work, have important tasks, or simply want some quiet time. 3. Promotes strong mental health: It's not uncommon for dogs to get bored, especially when left alone for long periods. Designed with interactive features to stimulate your pet's natural instincts to play, it helps keep your pet happy and active. 4. Built-in battery powered motor: The ball rolls automatically from the internal motor. Just unscrew the ball, insert one AA battery, press the button on the top, and let your pet enjoy hours of play. 5. Automatic movement and interaction: The plush ball rolls automatically. Its unique interactive design sparks your pet's curiosity and keeps them engaged. Includes 4 machine washable covers: Each ball comes with 4 different machine washable plush covers for variety and easy cleaning. Notice: 1. Actual color may be slightly different from the image due to different monitor and light effects. 2. Please allow 1-3 cm deviation due to manual measurement. Material: Plush + reusable plastic Size: 13.5 x 13.5 x 13.5 cm Power supply: 1 AA battery (not included) Package includes: 1 x Magic Rolling Ball (with 4 plush covers)