Keep Fido playing past sunset with the MeteorLight LED K-9 Ball.Made of extra durable rubber for long life, even against the thoughest bitesTake it to the campground, pool, or the lake, this ball is water resistant and floatsTennis ball size; 2.55" diameter, 4.5 oz20 - 30 hours of runtimeUser replacable battery includedItem SpecificationsDefined ColorBlue