This musical Tesla has the function of wireless mission and speakers, and can ignite gas tubes and bubbles. It's a perfect teaching tool, sparks students' interest in science, and makes a great gift. Long Arc Mode & Music Mode: Long arc mode releases-lightning at a fixed frequency. When the knob is turned to medium power, the-lightning is touchable, but you will only feel a slight sting. Music Mode: Connected to the device via Bluetooth, square wave music can be played, and lightning-energy is concentrated in the cluster. You can see the arc of the Tesla coil beating to music and it will present an amazing sparkling melody. It is small enough, only 3.5 x 3.5 x 1.3 inches (about 8.9 x 8.9 x 3.5 x 3.3) Using complex circuit design and upgraded larger top booster coil, the optimized Tesla coil is long and thick , has amazing energy. Turn the sound slowly to avoid a big impact from the arc sound. Before turning on, be sure to turn the 2 knobs counterclockwise to avoid a sudden loud noise that scares you. The independently developed Bluetooth chip can adapt to all mobile phones, computers and other Bluetooth devices, making the Bluetooth connection more stable. Type-C is also supported. Features better coil technology, covered in gold-plated clear ink for better dust resistance and greater stability. The wireless mission experimental model requires no audio cable connection and is simple to operate, just tighten the discharge pin, reduce the power and frequency, plug it in to present stunning sparkling melody. What a wonderful little thing this Tesla Coil is! It's a great conversation piece. It's also a cool piece of art that even just stands on your desk. Warn: 1. Not suitable for people using electronic-medical devices. 2. The Tesla coil will interfere with electronic products when working. This is a characteristic of the Tesla coil itself. Therefore, please do not let your phone close to the Tesla coil to avoid damage. 3. Do not use Tesla in environments wi