Feature:1. BLUETOOTH CONNECTIVITY: Play music via Bluetooth connectivity and you'll see the arc of the coil pulsating to the music, concentrating musical thunderlight energy in clusters.2. WIRELESS TRANSMISSION: Music coil speaker has wireless transmission and speaker function, it can light up neon lights, you can touch it at will, there will be a tickling sensation, it can effectively attract attention and improve students' exploration ability.3. CONTROLLABLE: Music coil is wireless, no need to ground and voice frequency cable connection, slowly increase the power to control the thunderlight arc gradually larger, you can also connect your cell phone, switch to music gear, let the thunderlight change with the rhythm of the music.4. LIGHT UP LED BULB: Solid state music coil can be placed horizontally or vertically, plug it in and light up the LED bulb, it will work like a charm and is a fun art decoration.5. SCIENCE TEACHING TOOL: Music coil can wirelessly light up all kinds of gas lamps, such as neon lights, fluorescent lights, old energy saving lamps, etc. It's perfect for people to learn science and physics, and it's a great physics and science teaching tool.Specification:Item Type: Bluetooth Music CoilMaterial: Aluminum AlloyPower Supply: Maximum 48V 1.5APower Connector: 5.5x2.1mm DC PortPlayable Music Format: Quadrate Wave MusicVoice Frequency Input: Bluetooth Compatible Connection to Cell Phone (Cell Phone Search for Bluetooth Compatible Device for M18)Arc Length:Fixed Frequency Mode: Approx. 0-8cm / 0-3.15inMusic Mode: Approx. 0-5cm / 0-2.0in.Package List:1 xBluetooth Music CoilNote:1. Not suitable for people with electronic medical devices.2. Minors should be accompanied by their protector.3. thunderlight has heat, please do not approach flammable and explosive items.4. Please do not place anything on the top surfaces, which may cause the shell to burn out.5.Without power supply