Supra Plus Binaural wide band headset. Hands Free efficiency. Acoustic shock protection. Quick disconnect. Robust design & construction for exceptional reliability. Noise-cancelling microphones. Binaural cuts out distracting background noises. New boom & microphone design for enhanced noise reduction. T-bar support & 'floating' receivers. Connection cable not included. For further information please call the Plantronics helpline on 0800 410014. Check compatibility at http://www.plantro.net/en/compatibility.html.