About Tesla The Tesla coil, invented by inventor Nikolai Tesla, is one of the simplest artificial lightning generators. Tesla coil can be used to create dazzling artificial lightning, Tesla can not only be used in games or art, but also for various scientific experiments, such as wireless power transmission, wireless lighting, insulator voltage test, sewage treatment, teachers use it to demonstrate the principle of voltage boosting to students, high frequency convergence, and so on. Teachers use it to demonstrate to students the principle of voltage boosting, high frequency skin effect, etc. Package List 1 x Bluetooth Music Tesla Coil 1 x Adapter 1 x Secondary Coil 1 x Annular Coil 1 x Discharge Needle 2 x Small Neon Lamp When you turn on normal mode, you can touch the arc lightly, when the arc is concentrated at one point, there will be a burning sensation, if your fingers feel uncomfortable, you can retract your hand.You can connect to Bluetooth by searching for the Bluetooth name on your phone, or connect the Tesla Coil to your phone or computer via a 3.5mm audio cable. Using music coils to create magical and beautiful scientific experimental phenomena Note: Not suitable for people with implanted electronic medical devices.Do not touch the secondary coil with any conductors.Do not use coils on metal workbenches.Keep away from flammable and explosive materials.When music mode, the arc size cannot exceed the 11 o'clock direction. If the knob pointer exceeds the direction of 11 o'clock and the power is too high, the Tesla coil will enter the protection state and stop working. Bluetooth will also disconnect automatically. You need to stop the Tesla coil and restart it. In normal mode, the frequency and arc size can be adjusted at will.In the music mode, it is not recommended to touch the arc, because the frequency of the music mode is controlled by the music, the frequency is faster than the normal mode, the power is higher, but it is also very safe, you can try to touch it.When using the audio cable to connect the smartphone to the Tesla coil, it may cause the touch screen to malfunction, which is normal. After unplugging the audio cable, the phone goes back to normal. This is characteristic of almost all Tesla coils.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.