1. This is an electric cat toy, the exterior is made of healthy and environmentally friendly TPR [Bayer, Germany] soft material 2. Can be charged via USB, built-in 260HA capacity polymer battery. 3. The bottom switch can adjust the start and stop, the toy will vibrate irregularly when the toy is in use, so as to attract the cat's attention. 4. There are molar bumps on the outside of the toy, which can clean the teeth when the cat chews on the toy.