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 1 x Arc Music Coil 2 x Power Adapter