Gift Option 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. Two Modes There are two modes of long arc and music. In the long arc mode, the arc is bigger and cooler. In 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. 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. Small And Portable The 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. 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.