This music has the function of wireless transmission and loudspeaker, can light gaseous tube and kind of .It is a perfect teaching tool to spark students' interest of science, also a great gift. It is a smart device for wireless transmission experiments. It can be used to create high-voltage and do scientific experiments, such as wireless power transmission, wireless lighting, and insulator withstand voltage test. Teachers use it to demonstrate the principle of boosting and high-frequency skinning to students. Effect etc. This music has circuit protection design, not damage the input device, can in better quality than normal arc plasma loudspeaker. BT connection, convenient and fast. Attention:1. In Bluetooth and mode it is recommended to use the device for about 8 minutes, then you need to disconnect the power supply to let the device stand for a period of time until the bottom of the heat dissipation and then use it again, if you use it for a long period of time uninterruptedly, it is easy to burn the MOS tube of the device 2. After connecting the Bluetooth mode, you need to adjust the volume of the phone's sound to the maximum, the coil in order to release the electric arc 3. The device is used to play the specified music (square wave music) please read the instructions carefully, it is not recommended to play other music, because it can not achieve better results, if you can not find the square wave music, please consult customer service to provide you with music playback link! Voltage: AC100-240V Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. Colour:White Material:plastic Package Contents: 1 x 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.