Your dog could play with this flashing ball happily even at night with LED light built-in, bring endless fun to your loved pet and can be used as training toy also. Features: Non-toxic and bite-resistant, safe for pet chewing or playing. Power-saving design, glowing for 20secs and automatically turn off for one bounce. Simply bounced once to light up the ball - even that is fun! Built-in LED light, colorful visible, convenient for night use. Can divert attention, remove anxiety and stabilize pet emotions. Used for your pet’s molar, chewing, biting, playing or training. Specifications: Material: rubber Color: red; yellow; blue; green; orange; pink (optional) Size: S; M; L (optional) Battery: built-in 2 * CR2032 button battery Proof Rate: IPX8 Ball Diameter: S: 53mm; M: 61mm; L: 72mm Item Weight: S: 74g / 2.61ounce; M: 100g / 3.53ounce; L: 150g / 5.29ounce Package Weight: S: 84g / 2.96ounce; M: 116g / 4.09ounce; L: 167g / 5.89ounce Package Size: S: 155 * 103 * 54mm / 6.10 * 4.06 *