Feature: 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. Good 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. Plug and Play: 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: Yellow Arc Length: 0-10cm/0-3.94inch (Adjustment by RotatingSwitch) Power: 0-100W BT Name: XFW M18. Package List: 1 x Arc Generator1 x Adapter1 x Discharge Needle2 x Small Neon Lamp Note: 1. Not suitable for people with electronic medical devices.2. Do not touch while working.3. Please do not use it in an environment with flammable and explosive materials or closed coils and large sized metals.