Features QUALITY MATERIALS: Made of quality PCPET material, this dog toy is sturdy enough to withstand pet bites and scratches. Maintains durability in both smart and normal mode and can be used for a long time LED Lightings Effect: Equipped with a bright LED light rings, it can be clearly seen in a dim environment, adding fun to night walks or indoor games Smart-Activation: When your dog touches or bites it, the shaking dog ball will automatically roll and rotate for 5 minutes, and then enter standby mode PROMOTES MUSTRIAL AND PHYSICAL DEVELOPMENT: This toy not only provides physical exercise but also stimulates the mental development of your pet. Your pet can choose different modes according to your preference, such as solving puzzles, chasing moving part, and allowing you to experience a full growth while playing PERFECT FOR SMALL TO MEDIUM DOGS: Specially designed and sized for small to medium sized dogs to accommodate a variety of breeds, providing an interactive experience to suit your dog39;s needs and style of play. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Battery capacity: 200 mAh Size: 52 mm in diameter Package List: 1x Automatic Rolling Dog Ball