Rechargeable USB version: you don't have to change the batteries again and again. Just plug the cable in for 1.5 hours and your cat will have up to 4 hours of fun. After the ball has been rolling for 15 minutes, it will automatically turn off, without having to manually press the pause to avoid wasting energy. 360 Degree Self-Rotation: The main purpose of the self-rotating ball is for your pet to chase the ball and have fun. With just one push of a button, the ball rotates 360 degrees and attracts your pet's attention. The ball moves continuously around your house and creates a red light at the same time. Automatic Change of Direction: Due to the spherical shape and self-balancing system, the ball will automatically change direction when it collides with a wall, chair, door, etc. No additional assistance is required. All you have to do is turn the ball on to play and it will turn off when your pet runs out of energy and is done playing. Environmental protection and safety: The cat game ball is made of environmentally friendly ABS material, is safe and non-toxic, grips and bites. And the LED light on the ball won't harm your pet's eyes. With a diameter of 6.2 cm, this toy is suitable for small and medium-sized pets. Warning: The ball is best rolled on hard ground, may not roll well on thick carpets. Contents of the box: 1 x Smart Interactive Cat Toy Ball. 1 x USB charging cable. 1 x User Manual (English language not guaranteed).