This is a small Tesla coil. The Tesla coil can generate a high-frequency high-voltage alternating current, and generate an arc through the discharge end, and also generate electromagnetic waves. The high-frequency and high-voltage electromagnetic wave signals can excite some gas-containing lamps to make the lamps emit light. The Tesla coil adds audio modulation to the circuit, so when a music signal is input, the arc emits a musical sound that becomes a plasma speaker. The tip of this coil is designed to replace different discharge ends, thus achieving the effect of the ion windmill ion garland. When the discharge end is replaced by an antenna, the Tesla coil can be a good wireless transmission tower and become a low-power medium-wave radio station, thanks to the proper setting of the product parameters.