Features: 1.2 Modes: The coil has music and lightning modes, wireless power transmission enables the light bulb to emit light without any contact or connection. 2.Music Mode: You can use a mobile phone to connect and play special square wave music, lightning will flash with the rhythm and generate electric sound by vibrating the air. 3.Knob Adjustment: The coil can emit lightning of about 10cm, turn the knob to adjust the length and frequency. The arc effect is like a branch, you can touch it, the dancing lightning is like massaging your hand. 4.Experiment Model: The coil can be used to generate high voltage lightning and carry out various scientific experiments, such as wireless power transmission, wireless lighting and dielectric withstand voltage tests. 5.Circuit Protection: This music coil has a circuit protection design, which will not damage the input device. Just install and insert an electric needle, play square wave music, you can feel the charm of lightning and music. specification:Item Type: Music Coil Material: PCB Host Size: Approx. 100x100x50mm/3.9x3.9x2in Plug Voltage: 100-240V Power: 0-100W Mode: Music mode, lightning mode Support Music: Square wave music Arc Length: Approx. 0-10cm/0-3.9in PackageList: 1 x Music Coil 1 x Adapter 1 x Discharge Pin 2 x Small Neon Lamp Note1. It is not suitable for people with electronic medical devices. 2. Minors should 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.