Feature: 1. MULTI TIP DISCHARGE: Bluetooth music Tesla coil kit is designed with six discharge tips, any one of which is available. You can install one, two, or six. The middle tip provides the largest arc, it can produce a maximum arc of 3.93in 100mm. 2. DUAL CONNECTION MODES: You can connect via Bluetooth on your phone, or connect the Tesla coil to a mobile phone or computer through a 3.5mm audio cable (NOT included). Both methods can be effective for music mode, and we recommend connecting via Bluetooth. 3. MUSIC ARC MODE: When you turn on music mode, if there is no music playing, it will not produce arc. When you play the music, you will see the electric arc dance, very ornamental. Please turn the volume of the phone to the maximum so that the music mode can work normally. 4. AMAZING EXPERIENCE: In normal mode, you can touch the arc slightly. If your fingers feel uncomfortable, you can retract your hand. It's amazing, you can tell anyone and share the joy with them. It can amaze everyone and is a very cool collectible and gift. 5. HOW TO START RIGHT: No grounding required, no instructions required, install secondary coil and discharge needle, plug in the power, turn on the switch and it will work, fast and convenient to operate. Specification: Item Type: Bluetooth Music Tesla Coil Material: PCB, acrylic, aluminum alloy Power Output: 48V 2A Secondary Coil Diameter: Approx. 2in/51mm Maximum Arc Length: Approx. 3.93in/100mm. Package List: 1 x Host1 x Adapter1 x Secondary Coil6 x Discharge Needle (One Long and Five Short)2 x Small Neon Lamp Note: 1. Not suitable for people with implanted electronic medical devices.2. Do not touch the secondary coil with any conductors.3. Do not use Tesla coils on metal workbenches.4. Keep away from flammable and explosive materials.5. In music mode, the arc size cannot exceed the 11 o'clock direction. If the knob pointer exceeds the direction of 11 o'clock and the power is too high, the Tesla coil will enter the protection state and stop working. Bluetooth will also disconnect automatically. You need to stop the Tesla coil and restart it. In normal mode, the frequency and arc size can be adjusted at will.6. When using the audio cable to connect the smartphone to the Tesla coil, it may cause the touch screen to malfunction, which is a normal. After unplugging the audio cable, the phone goes back to normal. This is characteristic of almost all Tesla coils.7. MUSIC ARC MODE can only play square wave music.