Specifications:Product Name: Plasma SpeakerInput: 24V DCSize: 106mm*79mmAudio input: 3.5mm for the source device used Features:-The product emits sound by directly driving the ionized air to vibrate;-The product can restore the true tone to the maximum extent;-This is the best choice for DIY enthusiasts, taking you on a magical journey with technology and DIY. Package Included:1 Set × Plasma Speaker Working Principle:1. Under normal conditions, most of the molecules of air are neutral and uncharged. However, after high-voltage discharge, it becomes charged particles, which is called dissociation or ionization;2. The intense ionization process produces arc discharge. The cross-sectional diameter (thickness) of the arc is proportional to the current in the arc, and the thickness is the difference in the degree of air expansion;3. Controlling the magnitude of the current in the arc by the audio signal produces a corresponding wave, which is the principle of the ion speaker. Note:1. The product's tl494 chip is of stable quality and does not have a base;2. The voltage of this product exceeds 20kv, which has certain dangers. Buyers need to have sufficient risk awareness for high pressure;3. This product uses arc sound, which is completely different from the speaker of traditional microphone. Please do not compare the sound quality and volume with the amplifier speaker (see the video introduction for the specific effect);4. If the product is not working, please check if all components are well soldered, the GDT magnetic ring is disconnected,and the component is reversed or hot, etc. If you can't solve it, please contact customer service;5. The size might be slightly errored due to manual measurement. Your kindly understanding would be appreciated;6. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.