Input voltage: DC 12-50V (not more than 50v), over 2APower input interface: 5.5x2.1mm DC socketPlayable music : only square wave music can be playedAudio input: Bluetooth connection to mobile phone (mobile phone searches for the Bluetooth device )Product size: . 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 )Power: 0-100WWith 2pcs spare MOSFETTemperature control functionNote: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 . 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 or items within a range of 5m/16.4ft during use.3. Due to serious interference with metals. Please not 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 broken5. Please not 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 't know how to use it, please ' it on by yourself.Colour:blackMaterial:plasticPackage Contents:1 CoilOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.