Power input interface: 5.5x2.1mm DC socket Playable music format: only square wave music can be played Audio input: Bluetooth connection to mobile phone (mobile phone searches for the Bluetooth device M18) Product size: approx. 65 x 95mm/2.6 x 3.7inch (Diameter x H) Arc length: 30-70mm/1.2-2.8inch (actually it may be shorter or longer) Power: 0-100W With 2pcs spare MOSFET Temperature control function Note: Power supplies are not included in the package. It requires a 36V 2A power supply and a 12V 2A power supply (with 5.5*2.1mm interface). Precautions: 1. Because the frequency is too high, the heat of MOSFET will be relatively large. Please pay attention to the temperature of the heat sink during use, so as not to damage the components due to excessive temperature (mainly music mode). 2. Please not place flammable or explosive items within a range of 5m/16.4ft during use. 3. Due to serious interference with metals. Please not get close to the coils for electronic equipment such as mobile phones, computers, etc. to avoid damage. 4. Since the diameter of the secondary coil is extremely small, try not to bump it, so as to avoid the secondary coil winding being broken 5. Please not modify the equipment without permission to avoid accidents. 6. Not for illegal use. 7. Electronic knowledge is highly recommended. 8. It is only for viewing purposes, if you don't know how to use it, please don't power it on by yourself. Colour:black Material:plastic Package Contents: 1 Set of Tesla Coil