100% brand new and high quality. for on the basis of the general increase of the music player, you can play phone / computer music, a clear sound. 15-24 V DC input voltage. when 24 V, 5-10mm arc length meters is ideal, small size, power range and power, can be a long working uninterrupted, you can also take LED lit, foam Energy-saving lamps, frequency flash tube, you can play power transmission wireless, rotary arc and so on. Parameters: Size: 38 x 79mm. Power: 15 w Power Input: DC 15-24V, Current 2A, DC5.5 Interface. Audio input: 3.5 jack, you can connect your phone, mp3, computer audio Plasma speaker stereo speakers: the principle is to stimulate the plasma arc of air turned into air vibrations generated by the expression of a new concept, you can access your phone, mp3, computer audio input, this mini speaker for plasma arc speaker compared to the actual real experience better sound high-frequency response, and spark plasma arc speakers have good sound quality, stable and safe, you can play any song without earthing, easy to Use resources compared There is no doubt as a new member stereo home player! Principle of wireless transmission: a coil connected at both ends with both ends LED, near-emitter device, Qiliang LED, the principle is resonant wireless power transfer Material: PC+Metal Color as shown Precautions: 1, product safety, power is not high, not because of an electric shock, but is not recommended to touch the top of the arc coil, there will be a burning sensation. 2, after a long time the power does not touch the heat sink, the temperature is very high, especially when using a huge 24V high-voltage heat, reserve a fan interface, plus cooling fan if necessary. 3, it is not recommended to work on the body or other objects near the coil for coil, the coil within half a meter next to other objects can not be left blank, because other objects such as a good conductor coil will form a good Loop, coil to absorb energy, then pull the coil or unable to Water demonstrate the effect of the demo variation! please, note; 4, not for the phone, mp3 and other electronic equipment near the coil, the coil generates a high frequency magnetic field would interfere with these mobile phones, mp3 and other equipment failure or damage! Package Contents: 1 x DIY15W Mini Speaker Music for Coil Kits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.