"What? I didn't hear you!" IS A THING OF THE PAST! I have a Palm Treo 750W and have been searching endlessly for a bluetooth that I can actually hear AND be heard. This is it! It works and connects seemlessly.When I got it, I drove down the road with my windows down, the sunroof open and my stereo on 1/2 volume. Then I called my voicemail and spoke normally, not yelled, into the mic. The noise cancelling technology actually does what is says because when I played back my voicemail in that same environment I could hear and understand perfectly what I said. I could tell I had a radio on, but barely! There was no other wind noise or popping of the mic.I am the world's biggest skeptic on these things because I have 4 other bluetooths that are pure garbage. This is the best I've ever heard and it fits very comfortably. I can operate all the buttons easily and I can wear wire rimmed sunglasses just fine.I live in Washington state where you can't use your cell phone while driving unless you have a bluetooth device and this is the only one I would recommend and the price is fantastic! It's comfortable and almost seems invisible after a while. I almost never talk on my phone without it because I can hear better with it.