The Plantronics Vista M22 Amplifier brings superior sound quality & acoustic protection to your telephone. As well as providing compatibility with those telephones that do not allow direct connection of headsets it offers a range of additional features to enhance the sound quality of your phone conversations. The Vista M22 is also boosted by having Plantronics sound guard plus technology which ensures loud tones are quickly reduced to more comfortable levels & ensures that the normal, human voice remains natural & unchanged for face to face clarity of communication. The Vista M22 also has Plantronics call clarity technology which uses electronic signal processing to reduce phone noise & maintain constant volume levels, as set by the user. This ensures all conversations are held at a comfortable & consistent level, regardless of the loudness of the incoming call. Further advantages of the Plantronics Vista M22 Amplifier include: Wideband audio delivers enhanced wideband audio & more natural speech reducing repeats errors & listener fatigue Loud noise protection which reduces the level of incoming loud noises such as fax tones or whistle blasts to a more comfortable listening level Advanced echo management helps reduce echo often associated with voip telephony Background noise reduction reduces the level of background noise picked up by the headset microphone & also reduces the level of noise on the incoming signal to improve call quality Call volume equaliser maintains user selectable listening preferences regardless of the quality of the incoming call The plantronics vista M22 amplifier also comes with a 2 year warranty from the manufacturer. Features Wideband audio delivers enhanced audio & more natural speech reducing repeats, errors, & listener fatigue Loud noise protection reduces the level of incoming loud noises such as fax tones or whistle blasts to a more comfortable listening level Advanced echo management helps reduce echo often associated with voip telephony Background noise reduction helps reduce the level of background noise picked up by the headset microphone & also reduces the level of noise on the incoming signal to improve call quality Call volume equaliser maintains user-selectable listening preferences regardless of the quality of the incoming call