Features 1.[Working Principle] There are wireless transmission and speaker. It generates high frequency alternating current through chip oscillation and sound control. The electric arc pushes the air to produce sound and supports wireless power transmission. 2.[Upgraded Design] This Bluetooth music coil is small size, upgraded with bigger top boost coil. The arc is long and thick, and can send a beautiful arc of 8cm, presenting a perfect effect. 3.[Experimental Toy Model] Bluetooth music coil kit is the perfect teaching tool to stimulate students' interest in science. The fulgural artificial simulation can be used as a physics experiment. It can light up the air tube and various bubbles. 4.[Touchable] Connect Bluetooth and play square wave music. The coil's electric arc pulses to music. Medium power, it will feel itchy when touched by hand and improve students' learning exploration ability. 5.[Easy To Use] The music coil module can be placed horizontally or vertically and is easy to operate. Just tighten the discharge pin and plug in the power. Different discharges produce different tones. specificationItem Type: BT Music Coil Material: Acrylic, PCB Music Transmission Mode: BT AUX Sound Input Discharge Frequency: 5-50hz Arc Length: Approx. 0-8cm / 0-3.1in Input Voltage: 48V Plug :US Plug 100-240V PackageList1 x BT MusicCoil 1 x Power Adapter 1 x Instruction Manual 1 x Discharge Pin 3 x Accessories