Features: 1.[Two Modes] There are two modes of long arc and Bluetooth music. In the long arc mode, the arc is bigger and cooler. In Bluetooth mode, download square wave music. You can connect your phone to play music, and the arc will follow the music. Just simply toggle the switch close to the knob to switch modes. 2.[Support DIY Shape] Practical scientific wireless transmission desktop toy that produces beautiful arcs, you can DIY any shape you like with wire, then fix it on the discharge pin, turn on the power and you get a shiny pattern, very interesting. 3.[Easy To Operate] Just tighten the discharge pin, turn the frequency and energy knob to the minimum to avoid sudden sound when you turn on the power, and you can see the cool arc with a special power supply. It can send out about 10cm arc, 0 to 10cm adjustable. When you touch it, it is like a massage on your hand. 4.[Safe] Our arc plasma speaker has circuit protection settings. When connected to Bluetooth to play music, the input device will not be damaged. And the arc can be touched, it will not harm you. It can be used to generate high voltage thunderstrike for various scientific experiments. 5.[Small And Portable] The Bluetooth music coil is so small that it won't take up much space when placed on a desk or bookshelf. You can also easily put it in your backpack and take it to the office or school. It can be used for wireless power transmission, wireless lighting and insulator withstand voltage test. 6.[Gift Option] Bluetooth music coil also includes a host, a discharge pin, two small LED ambient lights and a dedicated power supply, you can give it as a gift to your family, friends and experience the unique attraction of electric arc in the palm of your hand. specification:Item Type: BT Music Coil Material: PCB Host Size: Approx. 100 x 100 x 50mm / 3.9 x 3.9 x 2in Plug Voltage: 100-240V Power: 0-100w Mode: Music Mode, Long Arc Mode Support Music: Square Wave Music Arc Length: 0-10cm / 0-3.9in Notes: 1. Not suitable for people with electronic medical devices. 2. Minors should be accompanied by their guardians 3. Long arc has heat, please do not close to flammable and explosive items. 4. Please do not place anything on the top surface, so as not to cause the shell to burn. PackageList:1 x BTMusicCoil 1 x Adapter 1 x Discharge Pin 2 x Small Neon Lamp 1 x Instruction Manual Note1. When the coil is in music mode, do not leave the power on for a long time without playing music. 2. Do not place large objects on the discharge pin to avoid arc release failure. 3. Manual measurement, please allow some errors.