FRU BLU bubble machine creates a large number of bubbles. To start, simply insert 4 x AA batteries (not included) and pour the FRU BLU bubble cartridge. Then you push the switch and children can look forward to thousands of glowing bubbles. In the package together with 0.5L filling. Pay attention to placement on a flat surface. FRU BLU bubbles radiate all the colors of the rainbow. FRU BLU bubbles are created thanks to a special fluid that is produced in the EU. They are durable and don't just crack.