The MFJ-392B superlight headphones are perfect for the radio amateur or shortwave listener. They are great for all modes - SSB, FM, AM and CW. The headband is padded for greater comfort as are each of the phones which also have their own volume/bass control. Impedance is 16 Ohms at 1kHz and sensitivity is 102dB/mW. Works in either mono or stereo mode, free 1/4in phono adaptor included.