The D1 USB dongle bundled with the SDW 60 HS headset. Double-sided Stereo DECT headset with ultra noise cancelling mic, mute button on the mic boom, not convertible. Super wideband audio capable. Headset pouch and charge cable included. KEY FEATURES: Make your DECT headset mobile Neat, plug-and-play solution, no base station necessary Double-sided wearing style Pack and protect your headset Broad compatibility