If you're like me, you've just about given up trying to find a reliable bluetooth headset and transmitter. Look no further. I bought this unit with the matching transmitter ("Sony Bluetooth Wirleless Transmitter for iPod (Black)"), and have been enjoying clear, reliable music ever since. This headset has a volume adjustment that actually works -- the upper volume range is amazing. The track-changing controls are also snappy (just flick to change). The unit pairs quite well with its own transmitter.Bluetooth is not great for deep sounds, so the bottom range is just okay. But the overall sound is better than any competing products.One recommendation that I am surprised no one has considered: an on-off switch that, once flipped on, automatically pairs without having to hold buttons down. All bluettoth headsets are guilty of this gaffe.