I bought this head set to use with my hp ipaq 510 voice commander. This headset works great with that phone. excelent signal and the sound is very clear. No one can tell I am using the headset, and it is just like using the hand set, voice very clear, you hear perfectly. besides this product is easy to set up and to use, and it is perfect for the hp ipaq, since with the control buttons that it has, you can have all the additional features that this telephone offers, like for example, dialing a number with a voice command, just click one button of the headset.I am very happy with this product, and I really recommend it for everyone with a hp ipaq 510 . I work just like the original headset that comes with the telephone without the mess of the cables, the only disadvantage with respect to this, is the fact that it is not stereo; but that is ok, since the stereo headsets are very expensive, and I do not really need it, since I just bought it to talk while I am driving my car, as a hands free device.