Feature: 1. CIRCUIT PROTECTION: Music coil is designed with circuit protection that will not damage the input device and can play better quality music than an arc plasma speaker, which can only play square wave music. 2. COMPACT: Bluetooth music coil is small enough, only 4x4x2 inches, but amazingly powerful. Turn the sound slowly to avoid being shocked by the arc sound. Be sure to turn the 2 knobs counterclockwise to the end before you turn it on so that the sudden loud sound doesn't scare you. 3. BLUETOOTH SUPPORT: Solid state music coil supports Bluetooth, no grounding, no sound cable connection. Designed for square wave music, it can only play square wave music. You can search and download square wave music online with detailed instructions packed. 4. WIRELESS LIGHTNING: You can wirelessly light up all kinds of gas lamps, such as neon, fluorescent, old energy saving lamps, etc. under the high energy electric field of lightning. 5. IGNITION MODE: Lightning is essentially a high temperature plasma, when the device releases lightning at a high frequency, it can ignite flammable materials like a flame. Specification: Item Type: Music Coil Material: Acrylic, PCB Discharge Frequency: 5‑50hz (Lightning Mode) Arc Length: 0‑10cm/0-3.9in Power: 0‑120W . Package List: 1 x Music Coil1 x Power Adapter1 x Discharge Pin2 x Small Neon Lamp1 x Instruction Manual Note: All data are measured manually, and there are certain errors in the measurement results.