Logitech Group HD Video and Audio Conferencing System delivers crystal clear audio razor sharp video and is so amazingly affordable that any conference room can be a video collaboration space. It just works. The expansion microphones (optional) extends the audio range of Logitech Group Video and Audio Conferencing System from 20 ft. to 28 ft. System Requirements: Windows 7 8.1 or 10macOS 10.10 or higher