Feature 1、Beautiful and Touchable: This arc music coil can create beautiful arcs for good decoration, and can be touched without injury 2、Music Playback Function: The device can play music through BT or audio cable, the BT connection can be successfully searched after the coil start and the prompt sound end 3、Precise Circuit Board: The circuit board is precisely assembled from many small parts, neatly arranged, beautiful in appearance and stable in performance 4、Wide Application: The coil can be used for games, art, performance, wireless transmission of electrical energy, learning, etc. 5、Great Gift: This mini arc music coil can be used as a really cool collectible and gift for your family, friends, colleagues, etc. Item Type: Arc Music Coil Material: ABS Power Input Interface: 5.5x2.1mm DC socket Playable Music Format: Only square wave music can be played Audio Input: BT connection to mobile phone (mobile phone searches for BT device M18) Arc Length: 30-70mm/1.2-2.8in (actually may be shorter or longer) Power: 0-100W Features: With 2 spare MOSFET, temperature control function Package List 1 x Arc Music Coil2 x Power Adapter Note 1. Because the frequency is too high, the heat of the MOSFET will be relatively large. Please pay attention to the temperature of the heat sink during use, avoiding damage the components due to excessive temperature (mainly music mode). 2. Please do not place inflammable and explosive items within 5m 16.4ft. 3. Due to severe interference with metals. Do not get close to the coils of electronic devices such as mobile phones and computers to avoid damage. 4. Since the diameter of the secondary coil is extremely small, try not to touch it to avoid the secondary coil winding being broken. 5. Do not modify the equipment without authorization to avoid accidents. 6. Not for illegal purposes. 7. Electronic knowledge is strongly recommended. 8. For viewing only, if you do not know how to use it, please do not turn it on by yourself.