Please attention for client from Brazil : 
<br />Due to logistical issue, this item cannot deliver to Brazil at present.We would resolve the problem asap.Sorry for the trouble.
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<br />Note: After finish installation, you need adjust the volume controller.
<br />If not, it is no any voice.
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<br />Specifications:
<br />Material: Metal
<br />Output power: 3W*2
<br />Adjustment way: Pulley
<br />Effective distance: 10m
<br />Speaker unit: 4ohm
<br />Distortion factor: 1%
<br />SNR: 70dB
<br />Frequency effect: 100Hz-20KHz
<br />Net weight: approx. 442g
<br />Gross weight: approx. 512g
<br />Product size: approx. 120*80*75mm/4.72*3.14*2.95''
<br />Package size: approx. 167*130*95mm/6.57*5.11*3.74''
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<br />Features:
<br />Rotating pulley can adjust the volume, it is more convenient than Touch control.
<br />Back phase reversal hole design to make a good heavy bass effect.
<br />Trapezoidal appearance and wood texture design, give you a best viewing experience.
<br />Low frequency transmitter, dual coil full frequency unit, using Dynamic boost frequency technology to ensure the high fidelity sound.
<br />With USB 2.0 interface and 3.5mm Audio interface. 
<br />It can be compatible with the audio output of the TV computer mobile phone and other audio equipment.
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<br />Included:
<br />2 x Desktop Small Speakers
<br />1 x Gift Box