
It wasn't very expensive so my expectations were low but I was very satisfied. Unlike some devices, you don't need batteries. You can charge it with micro USB and it lasts a long time between charges. No software to download. It connects to the headphone jack. What struck me was the great sound. I've used it on my phone, tablet and laptop. If I had to rate I would say it amplifies the sound by at least 4x. I don't crank the volume all the way up, but no matter how I use it, I never noticed any distortion in the sound. would recommend.

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