Logitech Group 3.5 Expansion Mic

Expansion Microphones: Extends the audio range of Logitech Group video and audio conferencing from 20 ft. to 28 ft. This is the expansion microphones only, does not include Logitech Group HD Video and Audio Conferencing System for Big Meeting Rooms Clear sound for larger groups and meeting rooms: Two mics expand the conversation to 20 people (from 14 with the speakerphone alone)