Features: 1.Multi Functions: Arc generator has wireless transmission and speaker function to light up neon lights and various bubbles, perfect for people learning the mysteries of science and physics. 2.Good Sound Quality: When plugged in, it will play amazing melody, the quality of playing music is better than curved plasma speakers, jumping to the rhythm of the music. 3.High Safety: The arc of the wireless transmission experiment model can be touched at will, with only a slight feeling and temperature, don't worry, use it with confidence. 4.Easy to Use: The wireless transmission experiment model requires no audio cable connection, and when plugged in, it will present an amazing sparkling melody. 5.Wide Applications: Music Tesla coil arc can be widely used in physics teaching, scientific experiments, electronic competitions, graduation projects, birthday gifts, etc. specification:Item Type: Music Tesla Coil Arc Product Material: PCB,Acrylic,Aluminum Alloy Color: White Arc Length: 0-10cm/0-3.94inch (Adjustment by RotatingSwitch) Power: 0-100W BT Name: XFW M18 PackageList:1 x ArcGenerator 1 x Adapter 1 x Discharge Needle 2 x Small Neon Lamp