Magnetic Fluid display in glass bottle with builtin sound responsive lighting and battery power Visualizes sound: The ferrofluid moves in dynamic postures driven by the rhythm of external sound or music, allowing you to visualize audio in real time. The Magnetic Fluid is known as the prototype substance used to visualize ferrofluid effects in Marvel movie visuals. Durable, attractive construction: strength ABS plastic shell with an imitation oak grain finish and crystal diamond decoration. The inner display uses a transparency glass bottle with nano iron powder and pure water. All materials are environmentally friendly and nontoxic. Builtin power and lighting: Integrated MIC for sound responsiveness and a white LED backlight. No external power line required; builtin battery supports up to 8 hours of operation on a full charge. Versatile use cases: Music partner for HIFI and Bluetooth speakers to accompany listening with visual motion Desktop creative ornament, ferrofluid display, or tensionrelief toy Ferrofluid dancing lamp for ambient lighting Piano surface accessory as a piano metronome Easy to use: Place it next to your speaker and it will dance to the music rhythm. Enjoy the visual ferrofluid movement while you listen, helping to relieve tension and create a calming atmosphere.