Features: 1.Small Body But Amazing Energy: The Bluetooth music coil is small enough, but it has an amazing amount of energy, turn the voice. Slowly to avoid big shock by the arc sound. 2.Type B This music has a circuit protection design, will not damage the input device, can play better quality music than arc plasma speakers, can only play square wave music. 3.Easy To Operate: Bluetooth music coil mode, no need for grounding, no sound cable connection, type B is designed for square wave music, can only play square wave music, very great. 4.Interesting: This music has the function of wireless transmission and speaker, which can ignite the gas tube and various bubbles. This is the perfect teaching tool to stimulate students' interest in science. 5.Touchable: Wireless transmission experiment desktop toy, the arc can be touched at will, only a slight feeling and temperature, no need to worry. It makes a very cool collectible and gift. specification:Item Type: BT Music Coil Material: Acrylic, PCB Arc Length: Approx. 0-10cm / 0-3.9in Color: Black Panel Power: 0-120W Voltage: 100-240V PackageList:1 x BT MusicCoil 1 x Discharge Pin 2 x Small Neon Lamp 1 xPowerCord 1 x Instruction Manual