Alpatronix AX200 X-tra Strong Portable Mini Capsule Dual Stereo Speaker for iPhone / iPad / Samsung Galaxy / iPod / Smartphone / MP3 or MP4 player / Laptop or Notebook / Desktop / or Tablet PC
I do like these little speakers; They produce crisp, clear sound loud enough to fill a room.  My only issue would be that playing music the same time as charging causes a distinct, loud hum.  As long as you limit your listening time to the battery life (for me, 5-6 hours or so), it sounds great.