1、2 Mode Adjustment: The music coil has music and lightning modes. Turning the knob on the coil can adjust the length and frequency of the light, which has a good arc effect. 2、Wireless Transmission: Wireless power transmission enables the light bulb to glow without any contact or connection, and supports mobile phone connection to play music. 3、Electric Arc Range: The arc length range is 0‑10cm, which can be adjusted by the knob, the electric sound is generated by vibrating the air and flashes with the music. 4、Good Protection: The music coil has a circuit protection, which will not damage the input equipment, with good heat dissipation, ensures safe and reliable operation. 5、Easy Operation: Just install and insert the electric needle, you can play music, which is perfect for wireless transmission experiments, is a perfect teaching tool. Item Type: Music Coil Kit Product Material: ABS, PCB Color: Transparent Host Size: Approx. 90 x 90 x 32mm / 3.5 x 3.5 x 1.3in Power: 0-100W Bluetooth Name: MH-M18 Mode: Music mode, lightning mode Music Support: Square Wave Music Arc Length: Approx. 0-10cm / 0-3.9in 1 x Coil 1 x Adapter 1 x Discharge Pin 2 x Small Neon Lamps 1 x Electricity Pin