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BLUETOOTH MUSIC MODE: Connect a compatible smartphone via Bluetooth to create a music-responsive electric arc display. Specially prepared square-wave audio provides the clearest effects; ordinary music tracks may produce less distinct results. ADJUSTABLE ARC GENERATOR: Produces visible high-frequency electric arcs with an adjustable length of up to 80 mm under suitable operating conditions. Designed for visual demonstrations of electrical discharge and plasma effects. WIRELESS LIGHTING EFFECTS: The high-frequency electromagnetic field can illuminate suitable gas-discharge lamps without a direct wired connection, helping demonstrate the principles of electromagnetic fields and wireless energy transfer. VISIBLE GOLD-PLATED COIL: The exposed coil structure and transparent enclosure make it easy to observe the device's construction. Its compact 106 × 106 × 58 mm design is suitable for desktop demonstrations and electronics hobby projects. FOR ADULT SCIENCE DEMONSTRATIONS: Explore electrical discharge, high-frequency effects and wireless lighting with this desktop Tesla coil. This is a high-voltage device, not a toy. Keep hands clear of operating arcs and discharge components, and use only in a suitable controlled environment.