The JPL JAC (RJ11) binaural headset offers the added value of a noise cancelling microphone which will eliminate upto 90% of the background noise making it ideal to be used at home or in the office. Further features of the JPL JAC binaural headset (RJ11) include: Noise cancelling dual ear headset, superb sound quality, lightweight leatherette ear cushions, built in acoustic shock protection, ideal for the home user & light office work, ultra light weight for all day comfort, robust construction, provides full handsfree capabilities, fully adjustable headband & has 1.2 metres of cable. The JPL JAC binaural headset is for use with telephones that have a headset socket (RJ11).