Product overview This compact Tesla coil reproduces the voltage, frequency effects of the classic Tesla coil design for demonstrations, experiments, and desktop display. It produces visible arcs, can light bulbs wirelessly, and plays squarewave music through the arc using Bluetooth audio input. No grounding or audio cable is required for normal operation. Key benefits Demonstrates electricity concepts clearly: boosting, frequency skin effect, wireless power and lighting. Easy setup and use: plug in, pair Bluetooth, and start experiments or music without complex wiring. Safe for educational demonstrations when used correctly: low power and frequency allow arc interaction in controlled conditions. Portable desktop unit suitable for classroom demonstrations, lab experiments, and hobby displays. Main features Bluetooth music playback: pairs with mobile phones, computers, and other Bluetooth devices. Bluetooth name BTYSKJ. No audio cable connection required. Only squarewave music is compatible. USB flash disk included with 122 squarewave songs. Adjustable arc length: 0 to 10 cm adjustable by potentiometer. Compact size: primary listed size 4.8 x 4.8 x 2 in. Also noted compact footprint approximately 4.25 x 4.25 x 1.97 in. Plug and play: detailed manual included. Before powering on, turn both knobs fully counterclockwise to avoid a sudden loud sound. No grounding required for normal operation. Improved stability: upgraded Bluetooth chip for more stable connections and broader device compatibility. Coil surface coated with goldplated and transparent ink for better dust protection and improved performance. Package contents Tesla coil x1 Light bulb x2 Power supply x1 Discharge needle x1 Electroacupuncture probe x1 USB flash disk with 122 squarewave songs x1 Detailed manual included Simple setup steps 1. Install the discharge needle. 2. Connect the power supply to the unit. 3. Turn both knobs fully counterclockwise before switching on. 4. Search for Bluetooth on your mobile device and connect to Bluetooth name BTYSKJ. 5. Play squarewave music to produce audiomodulated arcs. Note only squarewave music is supported. Performance and compatibility Arc characteristics: frequency, lowpower arcs that display skin effect; arcs can be safely touched under proper conditions for demonstrations. Lighting: can light ordinary incandescent bulbs and gas discharge bulbs through the air. Music modulation: audio is modulated into the arc for visual sound representation; prolonged discharging near the panel may deform the enclosure or damage the coil. Use scenarios Classroom demonstration: show boosting, skin effect, and wireless lighting to students during a physics lesson. Lab and hobby experiments: perform insulation withstand voltage tests, basic wireless power experiments, and audiomodulated discharge observations. Decorative and educational display: use as a desktop ornament in a study or office that doubles as a conversation piece and learning tool. Safety and important notes Not suitable for people with electronic medical instruments. Do not touch the coil while it is operating except under instructed and controlled demonstration conditions. Do not use the device near flammable or explosive materials, in enclosed metal containers, or near large metal objects. Do not place objects directly above the coil panel during prolonged discharging; heat and deformation may occur. If any parts are missing or there are product issues, contact the seller for support as described in the included manual. Technical parameters Arc length: 0 to 10 cm, adjustable by potentiometer Tesla coil size: 4.8 x 4.8 x 2 in (compact footprint approx 4.25 x 4.25 x 1.97 in) This description reflects the product specifications, included items, and operational guidance supplied with the Tesla coil. Follow the manual for full setup and safe operation.