3D sound technology hi fi speaker with USB powered

Feature: 

* Built-in active amplifier
* USB bus-powered capability, no adapter required
* 2-Channel stereo with 3D sound effect and passive bass boost
* Conveniently powered via with USB cable
* Easily control volume with VOC on the back
* Durable for long-term use
* Size:70×100×160mm, weight: 0.9kg

Specification:

* Power output: 3.5W*2 RMS
* Speaker size: 2"*2
* Speaker: 4Ω 3W
* input sensitivity: 400mV
* Distortion: ≤0.2 %( 1W 1KHZ)
* Frequency response: 96Hz-20KHZ
* Separation:≥78dB
* S/N Ratio: ≥80dB
* 3.5mm audio output jack
* Power Voltage: USB/DC 5V
* Accessories:USB cable, audio cable

Other details:

* USB & Audio cable : 140cm in total 
* conntecting  cable :120cm 
* screen printing   LOGO with one color 
* inside magnetic trumpet 
* with diaphragm 

Packaging:

* QTY: 16PCS/CTN
* Gift box:190×133×194mm
* Carton: 551×394×408mm
* N.W./CTN: 16.2KGS
* G.W./CTN: 17.1KGS