BT Accord 30 is the ideal companion for your corded telephone or telephone system. It comes with a noise cancelling microphone (ideal if you work in a noisy environment) and a simple configuration module which will fit most types of corded telephones. As BT Accord 20 telephone headset with an amplifier for telephone and PC use Improved stability for use with more types of telephone systems Fits all PC sound cards Speaker and microphone volume control 'Automatic Battery Saving' function Quick switch for use of headset or handset Mute button Quick disconnect cord Meets FCC, UL and CE standards Compatible with the BT Paragon 450, Converse 1100, 1200,1300,1400 Range, Diverse 6000 range and Freestyle 7000 range