2309-820-105 is a Jabra BIZ 2300 QD duo headset with quick disconnect plug that provides instant connectivity to a wide range of desk phone systems in contact center environments. The Jabra BIZ 2300 works hard, looks great and is designed for easy daily handling. It is a headset built to be comfortable all day long. Jabra BIZ 2300 is built with total cost of ownership in mind. Beside 360 degree rotating break proof boom arm and Kevlar-reinforced cord, Jabra BIZ 2300 is built to withstand any punishment a high-performing contact center can give. Speakers with wideband/HD voice frequency response enable realistic reproduction of human voices on optimized digital lines, e.g. IP telephony and Unified Communications. Standard (STD) variation microphone sensitivity is comparable to a normal telephone receiver and is used in most telephone devices.