Pyrus Electronics (TM) Powerful Super Micro Mini Portable Bluetooth Speaker with Micro SD Card Slot & Audio Input Ports for PC / Phone / Tablet / Apple iPod Touch / iPad / iPhone 4 / MP3 Player (Black)
This is def a stong, acoustically sound speaker.  very easy to connect.  good bluetooth range.  I bought this speaker to play lullabies for my daughter in the night.  I liked the fact that it had a microSD slot, so it wouldn't have any extra things to plug into that she would pull on, or have it tethered to another device for music.  The problem is:  there is NO volume control on this speaker.  So if you plan on using it bluetooth most of the time, this won't be an issue, but this slight oversight makes the