[Endless Fun] This music has the function of wireless mission and loudspeaker, can light gaseous tube and kind of . The arc of the wireless mission experiment model can be touched at , with only a slight feeling and temperature, use it with confidence. It is a perfect teaching tool to spark students' interest of science, also a great gift. It's also a cool piece of art even just stands on your desk. [Long Arc Mode & Music Mode] Long arc mode and music mode: Long arc mode releases- at a fixed frequency. When the knob is turned to medium power, the- can be touched, and you only feel a little tingling. Music mode: Connect to the device via Bluetooth, it can play square wave music, and -energy is concentrated in the cluster. You can see the arc of coil beating to the music, it present an amazing sparkling melody. [Small Body with Strong Energy] With complicated circuit design and an upgraded larger top booster coil, the optimized coil -arc is long and thick, which has amazing energy. Turn slowly to avoid big shock by the arc sound. Before power on, make sure to turn the 2 knobs counter clockwise to , just avoid sudden loud sound to scare you. [Easy to Use] The wireless mission experiment model requires no audio cable connection, easy to operate, just tighten the discharge pin, turn down the power and frequency, and plug in, it present an amazing sparkling melody. modules can be placed horizontally or vertically, depending on your preference. It's absolutely a magic for kids even for adults, they become for this coil. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC100-240V Colour:Black Material:Metal Package Contents: 1 * Bluetooth Music Coil Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.