Music Rhythm Lamp: This dancing ferrofluid music rhythm lamp serves as a scientific decorative lamp and lighting accent. When music plays, the light color changes and the ferrofluid moves in sync with the rhythm. Audio Visual Experience: The fluid speaker responds to audio input or volume by activating ferromagnetic fluid, enabling it to react selectively to high or low frequencies. Interior Decoration Light: Simply plug in and turn on the switch for easy operation. Premium Material: The ferrofluid speaker is constructed from high-quality PP material, designed for durability and long-term use. Holiday Gift: This ferrofluid visualizer lamp makes a great gift for science enthusiasts or those who enjoy unique home decor, adding a touch of technology and color to any space. Specification: This product does not contain batteries. Size: 11.5 cm x 11.5 cm x 7.6 cm / 4.53 in x 4.53 in x 2.99 in Package Includes: 1 x Dancing Ferrofluid Music Rhythm Lamp Note: Please allow slight variations of 1-2 cm due to manual measurement.