Features: This is an SSTC Tesla coil that generates high-frequency alternating current through chip oscillation. It can also be controlled by audio, allowing the arc to push air and create sound. It also supports wireless power transmission, making the SSTC Tesla coil a multifunctional piece of art with high playability, great display, and practical science education. A more complex circuit design was adopted, and a larger area of the upper boost coil was upgraded. Each accessory is made of real materials, carefully selected, and the dense circuit is integrated into a 10x10cm PCB inside the board, saving space and showing the perfect lightning effect. The optimized Tesla coil's lightning arc is long and thick. Connect to your phone and play characteristic square wave music, and you can see the arc from the Tesla coil beat with the music. With the knob turned to medium power, you can touch the lightning with your hand, you will feel a slight tingling, and you will appear extra powerful in front of your friends. At the same time, it is the perfect teaching tool to stimulate students' interest in science, and can be used as wireless power transmission, wireless lighting, etc. The product has 2 knobs, one to adjust the frequency and one to adjust the power. Before using the power, you must adjust the 2 knobs to the minimum, otherwise you will be scared by the arc and the huge thunder after the power is turned on. When using maximum power, the thunder from the device is inevitable, and sometimes your will feel very harsh, so you can only adjust the power, or turn off the device to ensure your environment is quiet. Use is convenient and simple, you just need to tighten the discharge needle, turn down the power, frequency and connect the power supply, and you can see the lightning in front of your eyes, slowly increase the power, control the lightning arc to gradually become larger and thicker, and you can also connect the phone, switch to the music switch, let the lightning dance to the rhythm of the music. (Not suitable for crowds, and precautions, read more s) Specification: Material: Plastic Product Color: Black Package Size: 22.5 x 19.5 x 8.5 cm Package Weight: 720g Power: 0-120w Power Supply Voltage: 110-240VAC 50/60hz Lightning Length: 0-10cm (Adjustable Knob) Package Included: 1 x Music Tesla Coil Artificial Lightning Desktop Toy