If you go on Amazon looking for wireless Bluetooth speakers, you'll come across many from companies you've never heard of. The Urge Basics Soundbrick, which retails for around $60, is one such speaker.
Like a lot of these products, it's got a somewhat generic design, but I liked its simple understated look. It keeps things simple with three buttons on top (volume up/down and a pause/play button that doubles as a call answer/button for the integrated speakerphone), and you'll find a power switch around back along with a Micro-USB port for charging the built-in rechargeable battery, and both a line input and output.
That line output will allow you to string a couple of speakers together for somewhat bigger sound or connect the speaker to a larger stereo or home-theater system and use the Soundbrick as a wireless transceiver to stream music from your smartphone or other Bluetooth-enabled device to larger speakers.
The speaker seems pretty well built and weighs in at 0.74 pound. It's almost exactly the same width and height as the Jawbone Jambox but it's got a bit more depth -- the speaker measure 6.0 x 2.2 x 2.2 inches (HWD). Inside there are two drivers, so this is ostensibly a stereo speaker (2 x 1.5W), though the drivers are so close together you get little to no stereo separation. Battery life is rated at 8 hours, which is about average for these types of inexpensive small Bluetooth speakers.