Features: 1. This is an SSTC Tesla coil to generate high-frequency alternating current through the oscillation of the chip, and it can also be controlled by audio, so that the arc pushes the air to make sound, and also supports wireless power transmission, so the SSTC Tesla coil becomes a piece with It is a multi-functional artwork with high playability, good viewing, practical science education and so on. 2. A more complex circuit design was adopted, and a larger area of the top boost coil was upgraded. Every accessory is made of real materials, carefully selected, and the dense circuit is integrated into a 10x10cm PCB Inside the board, it saves space and shows the perfect Lightnings effect. The optimized Tesla coil Lightnings arc is long and thick 3. Connect to your phone and play the characteristic square waves music, and you can see that the arc of the Tesla coil is beating with the music. With the knob turned to medium power, you can touch the Lightnings with your hand, you will feel a little 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. 4. 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 frightened by the arc and the huge thunder after the power is turned on.When using maximum power, the thunder of the device is unavoidable, and sometimes yours will feel very harsh, so you can only adjust the power, or turn off the device to ensure that your environment is quiet 5. The operation is convenient and simple, you only need to tighten the discharge needle, turn down the power, frequency, and plug in the power supply, you can see the Lightnings in front of your eyes, slowly increase the power, control the Lightnings arc to gradually become larger and thicker, and you can also connect phone, switch to the music gear, let the Lightnings dance to the rhythm of the music. (Not suitable for crowds, and precautions, read more descriptions) Specification: Material: Plastic Product Color: Black Package Size: 22.5 x 19.5 x 8.5cm Package Weight: 720g Power: 0-120w Power Supply Voltage: 110-240VAC 50 or 60hz Lightnings Length: 0-10cm (Adjustable Knob) Package Included: 1 x Music Tesla Coil Artificial Lightnings Desktop Toy Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.