Jabra PRO 9450 Mono Midi Replacement Headset only for use with PRO 9400 Series Base (Base Not Included) Noise Canceling Microphone reduces unwanted background noise and the noise-canceling microphones reduce unwanted background noise and are ideal in crowded and noisy, open office environments. 150m Wireless Freedom - Get wireless mobility up to 150 meters to fully control your Jabra hands-free solution with DECT technology. Answer calls, multitask and move freely around on your terms. HD Voice - High quality audio for crystal clear conversations Enjoy high-definition sound with HD Voice and get crystal clear, intelligible communication Remote Asset Management - Configure and implement the company's audio devices 100% remotely from one central point. You get the latest features and functionalities on one go with Jabra Xpress, a web-based solution. UC Plug-And-Play - Jabra devices feature intuitive call control and seamless connection to all leading UC applications and softphones.