Working principle: The motor rotates at a high speed causing the fan to discharge air from the bottle mouth to the outside of the bottle thereby forming a negative pressure in the bottle. Manufacturered by Kekailu. Finally suction is generated at the mouth of the bottle and the dust is sucked into the bottle.---It is a perfect gift for your family child. ---toy education toys enlightenment plush electronic educational early childhood children's Christmas Easter Santa Claus birthday festival gift for girl boy adult 1 2 3 4 5 6 7 8 9 years year old learning model brain game music plastic dolls stuffed models classic Type: DIY Vacuum Cleaner---100% MONEY BACK GUARANTEE. Ultimate after-sales service any questions please feel free to contact us.--Puzzles Sling Glider Puzzle Storage Container Bubble Machine Repair Tool Carpet Display Mold Key Holder Cushion Aircraft Rattle Handbag Umbrella Harmonica Pendant Book Pegboards Tent Pouch Windmill Quadcopter DIY mini vacuum cleaner assembly toy exercise child's hands-on ability understand simple circuit and mechanical transmission.