Alpatronix C3 Ultra-Portable Mini Capsule Speaker with Enhanced Bass & 3.5mm Audio Jack for Apple iPhone, iPad, iPod, Samsung Galaxy, Nexus, HTC, Blackberry, Nokia, Smartphones, MP3/MP4 Players, Tablet, PC, Laptop [SONPRE EDITION] - (Black)
The volume exceeded my expectations. One of the nice features of the speaker is that you can chain it with similar products to get the volume up a little further. I would be careful running the speaker on full blast though.. as soon as you hear it start to distort you could be damaging the speaker/ eventually blow the speaker. The sound quality is not bad, but not amazing. The speaker can be collapsed and locked into place, which is helpful with portability.  It can be used both when collapsed and expanded.