Ferrofluid Music Visualizer, Dancing Sound Sensitive，Ferrofluid Speaker Music Mate, Decorative RGB Light Ferrofluid Display Desk Toy for Table, Bedroom, Office, Study, Science GiftDesign InspirationFerrofluid is known as the prototype substance of the Marvel movie "Venom". The design purpose is to make the ferrofluid in the glass bottle jump out of different postures with the rhythm of the external sound music, so that the sound music can be visualized. Use ScenarioNote: This device does not contain a speaker and will not make any sound. The built in microphone picks up external music sound, no need to connect any additional