I used this headset about 3 times before I got tired of the complaints from the other end of the phone. People complained that they could not hear me, or that I was not coming through clearly enough. I used it with the amplifier.I also found the build quality to be very poor. Trying to turn the volume control thumbwheel was not easy. In short, I should return them, but not worth the return shipping. They're now at the bottom of my junk drawer...