Feature 1、[Multi Functional] This Bluetooth music coil can generate touchable artificial handheld lightning while offering Bluetooth music mode and the ability to light up LED bulbs, making it a perfect educational tool to motivate students interest in science. 2、[Circuit Safety] With built in circuit protecting, this music coil ensures that it will not damage input devices, providing better music playback than conventional plasma loudspeakers. 3、[Simple Operation] Specifically designed for square wave music, this coil allows for easy online search and download of such music without the need for additional equipment. 4、[Bluetooth Connection] With Bluetooth connectivity, this music coil is plug and play, eliminating the need for sound cables or grounding. Allows for power adjustment, frequency adjustment, and mode switching. 5、[Square Wave Music Support] The music coil supports square wave music, generating different tones based on discharge frequency. The arcs can also dance in rhythm with the music, adding a dynamic visual to your listening experience. Item Type: Bluetooth Music Coil Material: Acrylic Discharge Frequency: 5-45Hz ±10% Lightning Length: Approx. 0-10cm/0-3.9in Package List 1 x Bluetooth Music Coil 1 x Discharge Needle 1 x Induction Needle 2 x Small Light Bulbs 1 x Adapter 1 x Small Light Bulb Storage Box 1 x User Manual