Jabra Engage 55 SE UC Mono USB-A Headset, Inc Stand Category_Best4Headsets/Yealink Headsets so an external GN Netcom

so an external GN Netcom amplifier is needed (A connection lead is not needed when you use an Amplifier)

Wearing style: Monaural

T-bar support and ‘floating’ receivers for all-day comfort

Available in headset and helmet mount wearing style

This will be dependent on the the type of telephone system and handset you are using

Jabra Engage 55 SE UC Mono USB-A Headset, Inc Stand Category_Best4Headsets/Yealink Headsets so an external GN NetcomFeatures: Professional grade DECT wireless connectivity with up to 150m range Monaural (single ear) design for awareness of surroundings Noise canceling microphone with advanced digital signal processing Plug and play setup via USB A with Link 400 DECT adapter Certified for all major Unified Communications (UC) platforms Lightweight, ergonomic design for comfortable all day use Secure calls with 256 bit AES encryption and DECT Security Level C