My friends and I bought this out for our dorm room since it was pretty cheap compared to other wireless speakers and also because it belonged to a respectable brand.
its been 8 months since then, and the sound output is as new, no noise or disruption of any kind.
The loudness gets high(I would not say very high). It is not ideal if you wanna take it out for an outing and dance to bollywood item numbers, no! But if you have a calm environment and wanna listen to some eminem rap, akons Blues and R&B, or have a little DJ night with a few friends, then look no further.
The module has 2 buttons, one for switching it on to wired or wireless mode, another for bluetooth pairing. Theres also an AUX jack if you wanna connect it to some other device.
It does not support calls though, theres no mic in this. Just click the round tactile button for a few seconds till it gives a beep and then connect your phone to it via bluetooth.
The soundbox has a range of 20m I would say, if there arent any walls in between. Also I have seen connectivity problems with samsung phones but thats for you to decide.
So there it is. Go on and buy this but just for the sake of some solitary enjoyment.
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And Wait for my next review on the Redmi 4.