Get effective hearing protection while also listening to your choice of audio devices. Connect the Elvex Com-611 to an FM radio, MP3 player, communications radio, or similar device equipped with an output jack. The headset features a coiled cord with a 3.5mm stereo plug. In addition, three plug adapters are included to accommodate a variety of devices (2.5mm stereo, 2.5mm mono and 3.5mm stereo). Once connected, you'll hear sound from your device up to the maximum sound level allowed by the headset (85dB limiter). Use the external volume control to adjust the sound level.