Cord offers an improved experience for your customers. The cord enables different microphone setting levels which allow the microphone amplification to be adjusted in order to facilitate better transmitted sound for your call recipients. Ideal for call centric users, who listen and talk with customers for a living using Jabra Biz 1500, 2300 and 2400II headsets compatible with the 78xx/88xx Cisco IP phones series, and most standard desk phones using permutation A or B. Simply connect the cord and headset through the Quick Disconnect plug and set the microphone level to your preference.