High technology Just take off the ball cover and press the button, the automatic rolling ball could firmly absorb the dust on the floor by the rolling process. and never scratch your floors, easily clean dust and dirt, also easy to clean. Easy to wash With the zipper design on the ball cover, very convenient to take off and wash. Slimmer and fashionable symbol Four bright color and cute ball appearance, it is a perfect plush toy for your pets. perfect microfiber mop ball You no longer need to kneel on the floor to clean, it is a good household helper for you. Main Material: Fiber + Plastic Color of the ball: Black Cover color: Power yellow, green, blue, rose red : 1 x AA battery (not included) Diameter: Approx. 8cm / 3.15inch