I have a large bluetooth speaker for home but I wanted something to play music when we went to the beach. I remember Diamond Multimedia from the Diamond Rio MP3 players so I tried one out. It works great, just as I had hoped from a little speaker.
Could be the best portable speaker for playing music at 320kbps. But the sound vibration moves the speaker around especially on high volume. It could barely last over an hour on full charge as the speaker gets older.