The OontZ Ultra-Portable Wireless Bluetooth Speaker by Cambridge SoundWorks
One thing about this speaker that I truly love is the battery life. I personally used it overnight for 12 hours straight at a decent volume with one charge. I had to charge my HTC One twice just to keep up. The volume is not bad but with an EQ App on the phone you can really get a decent loudness out of it. The quality is just as good too, overall I am very satisfied with the speaker.