The pairing is easily done by bluetooth, my phone and my MP3 player is connected to it without problems. A small addition, the manufacturer has provided a jack cord to connect the enclosure to any device that does not have bluetooth (eg mp3 player of entry).
The enclosure has worked well for me two evenings. About 2 x 4 hours before the battery light turned red. At the same time, I have not recharged when I received evidence that the small chamber holds the road level charge and discharge.
Finally, and importantly, the sound is good. I was afraid of a nasal sound (given the small size of the product) but no, it's perfect. The enclosure still retains the deep songs. For the price, it is excellent.
I have not used the function call of the speaker because I do not put music on my phone, so I can not comment.