Features: 1. This is an SSTC Tesla coil. It generates high-frequency alternating current through the oscillation of the chip. It can also be controlled by audio to make the arc push the air to make sound. It also supports wireless power transmission, so the SSTC Tesla coil becomes a piece of equipment. It is a multifunctional artwork with the characteristics of high playability, good ornamental value, and practical science education. 2. Adopt a more complex circuit design and upgrade the top boost coil with a larger area. Each accessory is made of real materials and carefully selected. The dense circuits are integrated into the 10x10cm PCB board, saving space and showing the perfect lightning effect. The optimized Tesla coil lightning arc is long and thick. 3. Connect the mobile phone and play the special square wave music. You can see the arc of the Tesla coil beating with the music. Adjust the knob to medium power and touch the lightning with your hand. It will feel a little tingling, which makes it appear particularly powerful in front of friends. At the same time, it is a perfect teaching tool to stimulate students' interest in science and can be used as wireless power transmission, wireless lighting, etc. 4. The product has 2 knobs, one to adjust frequency and one to adjust power. Before using the power supply, the 2 knobs must be adjusted to the minimum, otherwise, after turning on the power supply, you will be shocked by arcs and huge thunder. When using maximum power, thunder from the device is unavoidable and sometimes even occurs. You will feel harsh, so you can only adjust the power, or turn off the device to ensure your environment is quiet 5. The operation is convenient and simple, you only need to tighten the discharge needle, lower the power, frequency, plug in the power, and you can see in front of you of lightning, slowly increase the power, and control the arc of the lightning to gradually become larger and thicker. You can also connect it to a mobile phone and switch to music mode to let the lightning dance with the rhythm of the music. (Not suitable for the crowd, please note, please read more instructions) Specifications: Material: plastic Product color: black Packaging size: 22.5 x 19.5 x 8.5cm Packing weight: 720g Power: 0-120w Power supply voltage: 110-240VAC 50/60hz Lightning length: 0-10 cm (adjustable knob) Package includes: 1x Musical Tesla Coil Artificial Lightning Desktop Toy