Jabra Evlv 40 Uc Stereohd Audio 6399-829-209, Black, Microphones Frequency 100 - 10000 Hz, Connector 3.5, Material Plastic, Used for Portable electronics,computer, Noise Canceling, Over-the-Head, Speaker, Microphone Jacks, Wireless or Wired. The Jabra EVOLVE 40 UC is a headset that is basically designed in order to improve concentrations and conversations and optimized for Unified Communication. It can offer essential and useful features that will absolutely.