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Vibration speaker Rated Power : 20W (RMS) Dimension: 50mm(diameter)x52mm(height) Impedance: 6 ohm Audio Socket: 2.5mm stereo jack DC Socket : 3.5mm DC 12V imput jack Power adapter: Input:100-240V,50/60Hz Output: DC18V/1.5A Audio Source:Laptop, PC,MP3,MP4,MD,CD,DVD player, Mobile phone,etc Weight: 420g Gross weight: 807g Packing: giftbox (20*12*9cm) Our suggestion on the better sound of the vibro speakers 1. Place the vibration speaker on the flat,solid & smooth sound board,such as woden,glass,etc... 2. Keep the cleanness both the bottom of vibration speakers and the interface of sound board. 3. The Bass sound will be better if the underside of the sound board is Box structure. 4. The sound board is wider,and the sound will be louder. 5. Don't put the Debris on the sound board,because the debris will cause much noise under vibration.