I am using the MP3 YP2 with bluetooth stereo headphones model # BH 604. i have no problem paring up with headphones as the MP3 indicates conecting nad then connected. however, no sound comes through. After many retries, the music finally comes through. But, when I turn off the sets, I have to do trail and error to get music to come through headphones despite "connected" indication on MP 3. Any suggestions ?