From Grand Illusions.

The Spirok Robo is a magnetic art display with dancing ferrofluid – a fusion of science, tech and art.

It has a built in microphone, and an internal rechargeable battery. Switch it on and the screen lights up. When there is no ambient sound, the ferrofluid settles at the bottom of the screen. But as soon as there is any sound, either music or speech, the ferrofluid dances in time with the beat of the music or the rhythm of the speech.

The Spirok Robo does not have an internal speaker and does not produce sound itself. It simply reacts to any sounds that it hears. There is no need for Bluetooth or any cables.

The magical liquid inside moves and dances to the sound like a living creature. Quite hypnotic!

This item is currently in the Grand Illusions Toy Shop –
https://www.grand-illusions.com/collections/magnetic-toys/products/spirok