Feature 1、Multifunctional: This wireless transmission experiment arc plasmac coil is manually touchable for safe operation, cordless flash, palm flash, dual mode ( voice line mode, bluetooth music mode), music playback mode, and frequency adjustment. 2、Easy To Use: This musical coil only needs to tighten the discharge pin, turn down the power and frequency, plug it in, you can see the flash in front of your eyes, slowly increase the power, control the arc gradually become bigger and thicker, you can also connect your cell phone, switch to the music gear, let the flash dance with the rhythm of the music. Please rest assured that it will not hurt you. 3、Touchless Lighting: This music coil arc plasma loudspeaker supports touchless lighting, lighting up neon bulbs without touching them. When the neon bulb is near the coil, the bulb will light up and when the neon bulb is far away from it, the bulb will dim. 4、Different Tones: This artificial spark gap arc generator produces different tones according to different discharge frequencies, and the big shiny arc can also jump to the rhythm of the music, with wireless transmission and speaker function. 5、Wide Application: This wireless transmission science teaching experiment model has a wide range of applications, and is designed for square wave music, bluetooth connectivity, plug and play, no sound cables or grounding required, easy to operate. Item Type: Music Coil Material: Transparent Acrylic Arc Length: Approx. 0-8cm / 0-0.31in Sound Interface: 3.5mm Sound Jack Discharge Frequency: 5-50Hz (Flash Mode) Size: Approx. 39 x 90 x 90mm / 1.54 x 3.54 x 3.54in Package List 1 x Coil Host 1 x Discharge Needle 2 x Light Bulbs 1 x Adapter 1 x Accessory 1 x Manual