Feature: 1. Musical Coil Toy Kit: This music coil has a circuit guard design that will not damage the input device. It can play square wave music of better than speakers, and by plugging in the power, the LED light bulb can be lit. 2. Easy to Use: No need to connect cable, just tighten the discharge pin, lower the power and frequency, and then insert it to present an amazing and sparkling melody. Supports horizontal or vertical placement. 3. Small and Powerful: This music coil arc generator supports square wave music. Generate different tones based on different discharge frequencies. Spark gap arcs can also jump with the rhythm of music. 4. Multiple Functions: This music coil has wireless transmissing and speaker functions, which can light up gas tubes and various bulbs, making it a perfect teaching tool to motivate students interest in science. 5. Complete Parts: With 0‑10cm arc length adjustment, equipped with discharge pin, induction pin, small light bulbs, and glass tube, this music coil kit can help you complete various scientific experiments, suitable for kids and adults. Specification: Item Type: Flat Music Coil Kit Plug: AC100-240V 50/60HZ Rated Power: 60W Discharge Frequency: 5-45Hz ±10% (Spark Mode) Electric Arc: Approx. 0-10cm / 0-3.9in Host Size: Approx. 113 x 113 x 50mm / 4.4 x 4.4 x 2in. Package List: 1 x Musical Coil Host 1 x Discharge Pin 1 x Induction Pin 4 x Small Light Bulbs 1 x Glass Tube 1 x Accessory Storage Box 1 x Power Adapter 1 x User Manual