Feature: 1. Easy to Operate: This music coil supports plug and play, BT connection, and does not require an audible wire or grounding. Supports power regulation, frequency regulation, and mode switching, simple to operate. 2. Small and Powerful: This music coil supports square wave music, and generates different tones according to different discharge frequencies. Artificial spark gap arcs can also jump with the rhythm of the music. 3. Multiple Functions: This music coil has wireless transmissing and speaker functions, can light up gas tubes and various light bulbs, and is the great teaching tool to stimulate students interest in science. 4. Interesting Scientific Experiment Kit: Supports dual mode (AUX audible cable and mobile BT connection), generates music sparks, touchable wireless sparks, supports music playback and frequency adjustment. 5. Wide Application: The input voltage of this music coil device is 48V, the arc length is 0‑8cm, and the discharge frequency is 5‑50Hz. It has a wide range of applications, suitable for more scientific experiments. Specification: Item Type: Music Coil Kit Material: Acrylic Audible Interface: 3.5mm Jack Music Transmissing Mode: BT, AUX Input Input Voltage: 48V Arc Length: Approx. 0-8cm / 0-3.1in Discharge Frequency: 5-50Hz (flashing thunder mode). Package List: 1 x Music Coil Host 1 x Discharge Needle 2 x Light Bulbs 1 x Adapter 1 x Accessory 1 x User Manual