Features: 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. specification: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 Plug Voltage: 100-240V 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 PackageList: 1 x Coil 1 x Adapter 1 x Discharge Pin 2 x Small Neon Lamps 1 x Electricity Pin Note1. It is not suitable for people with electronic medical devices. 2. Minors shall be accompanied by their guardians. 3. Thunder and lightning have heat, please keep away from flammable and explosive articles. 4. Please do not place anything on the top surface to avoid burning the shell.