High level hi fi speaker for desktop PC and smartphone external

Feature: 

* Built-in active amplifier
* USB bus-powered capability, no adapter required
* Conveniently powered via with USB cable
* Easily control volume with VOC on the back
* Durable for long-term use
* Size:73×95×235mm,
 weight: 0.9kg

Specification:

* Power output: 3W*4RMS
* Speaker size: 1.5"*2
* Speaker: 4Ω 3W
* input sensitivity: 400mV
* Distortion: ≤0.2 %( 1W 1KHZ)
* Frequency response: 120Hz-20KHZ
* Separation:≥78dB
* S/N Ratio: ≥80dB
* 3.5mm audio output jack
* Power Voltage: USB/DC 5V
* Accessories:USB cable, audio cable

Accessories:

USB & Audio cable : 140cm in total 
conntecting  cable :120cm 
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