FeaturesSingle earpiece allowing users greater call concentrationSupplied with quick disconnect system(QD) - QD compatible with GN or Plantronics**300° adjustable microphone boomNoise cancelling microphoneAcoustic shock protection with Active ProtectionT technologyThe JPL JAC Plus RJ11 Monaural Headset is an entry-level office headset suitable for regular phone users. The headset features Acoustic Shock Protection to protect the user\'s hearing and a quick disconnect lead which allows the user to quickly disconnect the headset and move away from their desk without removing the headset (this effectively puts the caller on hold).