🎉 Dance to the Beat of Your Own Fluid! Perfect for desktops, pianos, or as a unique gift. Built-in battery for 8 hours of rhythmic enjoyment. Transform sound into mesmerizing ferrofluid dance. Crafted from non-toxic materials with a chic design. Watch the fluid dance and let your worries fade away. High transparency glass Built-in MIC 8-hour battery life The Dancing Ferrofluid with Music Rhythm is a captivating desktop decor piece that visualizes sound through mesmerizing ferrofluid movements. Encased in a high-strength ABS plastic shell with a crystal-clear glass design, this eco-friendly product features a built-in microphone and an 8-hour rechargeable battery, making it a perfect companion for music lovers and a unique gift for teenagers.