Feature: 1. Bluetooth Music Coil: It generates high frequency alternating current through chip oscillation and audio control. The arc pushes the air to generate sound, supporting wireless power transmission. 2. Compact and Portable: The size of this Bluetooth music coil is 3.5x3.5x1.3in. The optimized coil flash arc is long and thick, and can emit a beautiful arc of more than 10cm, showing a nice flash effect. 3. High Performance: It is a good teaching tool to stimulate students' interest in science. The artificial simulation of flash can be used as a physical experiment. It can light various types of gas lamps, such as neon lights, fluorescent lights, and traditional energy saving lamps, understand the high energy electric field of flash. 4. Easy to Operate: Connect Bluetooth and play square wave music. The arc of coil will beat with the music. At medium power, when you touch it with your hand, it will feel itchy, which improves students' learning and exploration ability. Let the flash dance to the rhythm of the music. Different discharges produce different tones. 5. Nice Present: Supports AUX sound cable mode, allowing you to connect devices via an sound cable to play square wave music, while also enabling you to adjust the length of the flash and the frequency emitted. Whether you are a science teacher, amateur enthusiast or researcher, this device provides a hands on experience that can help you better understand basic scientific concepts. It is a valuable educational tool. Specification: Item Type: Bluetooth Music Coil Material: Acrylic Adapter Output: 48V 1.2A Flash Length: Approx. 0-10cm / 0-3.94in Bluetooth Mode: Support AUX Input: Support Product Size: Approx. 90x90x33mm / 3.5x3.5x1.3in. Package List: 1 x Bluetooth Music Coil 1 x Discharge Needle 1 x Adapter 2 x Small Bulbs 1 x Electrode Needle 1 x User Manual