Single ear telecom headset with over ear option included. Noise cancelling microphone. Land line and VoIP (USB) - MS Lync compatible. Electronic Hook Switch (EHS) or lifter options. DECT technology. Auto set up p plug and play. Automatic pairing. Mute the caller button on headset base. Changeable headset speaker colour - black or red. 8-9 hours talk time. In-use busy light indicator. 300 feet open space range. 2 year warranty.