A built-in unidirectional microphone that can be twisted discretionarily picks up your voice loud and clear. Reduces unwanted background noise for clear conversation. A great choice for public speak, Online courses, call center, conference calls, webinar presentations, and more. With 3. 5 mm jack/USB plug connection options, the 3. 5 mm jack audio cable can be detached from the control box or you can use the USB plug with control box to work with the PC. Convenient inline volume switch and Mic/Speaker mute for easy access, a built-in noise-reduction sound card of the control box lower noise output from devices.