The Tesla coil generates high-frequency alternating current through a chip. It can be controlled by audio to cause an electric arc to move the air and produce sound, and it also supports power transmission. The package includes a USB flash drive with 120 square-wave music tracks, which will be continuously updated. Connect your phone and play the unique square-wave music to see the Tesla coil's arc move rhythmically with the music. Small in size, only 3.9*3.9*1.9 inches, yet packed with impressive power. Please adjust the volume slowly to avoid being startled by the loud bang of the arc. Before starting, be sure to turn both knobs counterclockwise to their maximum position to avoid being startled by a sudden loud noise. Features a circuit protection design to prevent damage to input devices. The sound quality is superior to arc plasma speakers, but it only supports square-wave music playback. It can only play square-wave music, and the effect is perfect. It has transmission and speaker functions, can light up tubes, and generate various bubbles. It is not only a perfect teaching tool to stimulate students' interest in science, but also a multifunctional work of art that combines fun, visual appeal, and practical science education. It is an excellent gift for friends and family. Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. Voltage: AC100-240V Color: As Shown Material: Plastic+Metal Package Contents: 1 * Music Tesla Coil Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.