Features Compact Rechargeable: Portable design with easy USB recharging, making it convenient to use anytime, anywhere. Tail Design: The attached tail mimics prey, adding an extra elements of fun for your pet to grab and play with. Bite resistance and durability: Soft and skin friendly silicone wrap, in addition to rolling quietly, increases friction, and takes into account bite resistance and durability. Sturdy Construction: Made from premium, pet-safe materials designed to withstand playful paws. Physical Mental Stimulations: Encourage your cat39;s natural hunting-instincts and provide both physical exercise and mental stimulations, reducing boredom and destructive behavior. 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: Size: 55mm Battery: 150mah Package List: 1x Ball