[Long Arc Mode and Music Mode] Long Arc Mode releases Thunderbolt at a fixed frequency. When the knob is turned to medium power, you can touch the Thunderbolt with your hand and there will be a slight tingling sensation. Music Mode: Connect to your device via Bluetooth and play square wave music, the Thunderbolt energy is concentrated in clusters and you can see the arcs of the coils jumping with the music. [Stable Bluetooth Connection] Self-developed Bluetooth chip adapts to all mobile phones, computers and other Bluetooth devices, providing a stable connection. Better coil technology! It is covered with gold-plated transparent ink, dustproof and stable. [Compact Size] Size: 3.5x3.5x1.3 inches, with more complex circuit design and upgraded top boost coil with larger area. The optimised coil flash arc is long and thick. Turn the sound slowly to avoid being scared by the arc sound. [Ideal Science Teaching Model] This musical coil has wireless power transmission and speaker function to ignite air tubes and various bubbles. It is a great physics and science teaching tool. It can effectively attract students' attention and improve their exploration ability. [Simple Operation] Simple operation, just tighten the discharge pin, turn off the power and frequency, plug it in, you can see the Thunderbolt in front of your eyes, switch to music gear, let the Thunderbolt change with the music rhythm, very creative. Support Type-C.