Upgraded USB Rechargeable Cat Toy BallNo need for battery replacement. This smart interactive cat ball toy has built-in 250 mAh Li-ion battery, charge 1.5H can last 4 hours of fun. The USB rechargeable design is not only convenient but also environmentally friendly. Smart Auto-Rolling Chasing BallThis smart interactive pet ball will automatically change direction when hitting an obstacle. Perfect for the cat to chasing around to get more exercise and kill boredom when the owner isnt around. Non-toxic ABS MaterialOur interactive cat toy ball is made of high-impact, wear-resistant and non-toxic ABS plastic. It is durable enough and won't break up even hit the wall. No small parts, safe for your cat or puppy to play and lick. Cat's Best Tohe primary purpose of this pet electronic toy is to stimulate hunting instincts and have fun. Please using this auto-rolling cat ball on smooth floors, such as hardwood floor, tile floor or thin carpet. It may not roll well on thick carpet.