Feature: 1. Small Body, Big Power: The bluetooth music tesla is small enough, but powerful enough. When plugged in, there's an amazing sparkling melody that plays music better than curved plasma speakers. 2. Artificial Lighting with Music: Although this flat bluetooth tesla coil is only 4 inches in size, it emits a graceful 10 cm arc. Spark gap arcs can jump to the rhythm of the music. 3. Bluetooth Square Wave Music Playback: Each time the Tesla coil is discharged, the frequency of vibration will change, resulting in different tones. No grounding required, no sound cable connection required, just plug and play. 4. Endless Fun: This music model has wireless transmission and speaker function to light up neon lights and various bubbles. This Tesla coil can be touched at will with only a slight feel and temperature. 5. Wide Application: This bluetooth music coil model is very easy to use. The perfect learning tool for physics teaching, science experiments, e competitions, graduation projects, birthday gifts. Great for people to learn the mysteries of science and physics and let them enjoy touching it. Specification: Item Type: Bluetooth Music Tesla Coil Material: PCB, Acrylic, Aluminum Alloy Color: Red Arc Length: Approx. 0-10cm/0-3.94in (Adjustable by Rotate Switch) Power: 0-100W Bluetooth and Simple Operation: Bluetooth Name: XFW M18. Package List: 1 x Host1 x Adapter1 x Discharge Needle2 x Small Neon Lamp Note: 1. Not suitable for people with electronic medical devices.2. Do not touch the Tesla while working.3. Please do not use this Tesla in an environment with flammable and explosive materials or closed coils and large sized metals.4. Please allow some errors due to manual measurement.5. Please turn the sound slowly so as not to be overwhelmed by the arcing sound.6. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.