The Polycom Communicator C100S USB Desktop Speakerphone connects to your PC/Mac computer’s USB drive, giving you full-duplex, two-way telephone conversations over the Internet via e.g. Skype, Teams or Zoom. The communicator is a light-weight device powered via USB with two high-quality microphones. As per Polycom the communicator provides high-fidelity, CD-quality sound, along with unparalleled echo cancellation and noise reduction.

The used communicator is properly working with successful Speaker and Microphone tests on the mentioned applications.

Please see link to Polycom Communicator manual here.

More information from the manufacturers website:

Polycom Communicator C100S

High quality, hands-free calls from your PC. Untie yourself from your headset for remarkable voice quality. Enjoy the ultimate hands-free calling experience from your PC with Polycom® Communicator™. Based on the same technology used in the legendary Polycom line of triangular SoundStation® conference phones, Polycom Communicator enables crystal-clear, natural conversations without echoes or feedback. Enjoy the freedom of not wearing your headset for hands-free calls, or plug into the built-in stereo headphone port for private conversations.

Polycom Communicator delivers remarkable audio quality that enables seamless voice and video communications, without compromise. Two high-quality microphones provide excellent range for group conversations with up to four participants Polycom® HD Voice™ technology enables high-fidelity, CD-quality sound, along with unparalleled echo cancellation, noise reduction and full duplex performance.

The unit connects and powers through an integrated USB cable for easy installation and use—no extra cables to carry or batteries to charge. Its small size and carrying case make it easy to take with you. Plus, the high-fidelity speaker doubles as a great portable solution for CD-quality music and presentation audio.

Integrated button controls allow you to launch voice and video applications and pick up or hang up calls without using your mouse. Convenient buttons and indicators for volume control and mute are also built-in.

No other product comes close—only Polycom Communicator delivers a hands-free PC calling experience featuring:

• Remarkable voice quality
• Two high-quality microphones
• Polycom HD Voice, with industry-leading echo cancellation and full duplex technology
• Integrated button controls for a seamless user experience

Benefits

• Hands-free freedom—Untie yourself from your headset for clear one-on-one calls or group conversations
• High-fidelity speaker—High-quality audio for the best possible voice and video calls.
• Hardware supports up to 22kHz for CD-qulaity music or presentation audio
• Two high-quality stereo microphones—Others on your call will hear every word clearly, whether you are in an office or a conference room
• Easy to use – Convenient buttoms enable you to launch applications, pick up and hang up calls, and control volume and mute
• Built-in stereo heaphone port – Plug in headphones for private conversations, or unplug to go hands-free
• Ultimate portability – The integrated USB cable stores inside the unit for portability and convenience