High quality construction - Built with ABS plastic, high-clarity glass, nano iron powder, and non-pure water for a durable ferrofluid display. Wireless white LED backlight - Backlight operates via an internal battery, no cords required, providing up to 8 hours of use per charge. Music visualization - The Sound Fluid provides a music visualization. As the rhythm changes, the ferrofluid moves in speed and shape, creating a dynamic visual display. Silent art device - This product is not a speaker; it is a visual art piece that does not produce sound on its own. Practical applications - Home decor: add ambient visual interest to a living room, bedroom, or media area. - Music accompaniment: pair with other audio sources to enjoy a visual display synchronized with your tracks. - Desk or gallery display: suitable as a striking centerpiece on an office desk or as a visually engaging exhibit at events.