Omni-directional technology picks up sounds emanating from any place in the room so your staff can be heard on the other end of the video conference. The speakerphone provides two-way communication, a mute button allows for privacy and a mute light indicator shows that your staff can talk among themselves without the other side hearing them. 3-year limited warranty. Increases your camera microphone's range from 20 feet to 28 feet using convenient, plug-and-play capabilities. Complies with RoHS and Green standards. Wired connectivity via 4' cable for a quality and reliability. Microphone type: Detachable. 4' long cable. Dimensions: 0. 8"H x 3. 3"W x 3. 3"D. Omnidirectional microphone picks up sounds from all sides. Optical trackball and scroll wheel for accurate cursor functionality. Logitech black expansion microphones for the GROUP system come in a set of two for customization. Plug-and-Play Technology All you do is plug both microphones into the GROUP system camera on your tabletop to activate the microphones. There is no software to download or complicated settings to adjust. Just put the microphones on your existing table alongside your videoconferencing camera and you have instant expansion. Increase Audio Range Increase the audio range from 20 feet to 28 feet surrounding the GROUP system. This allows you to include more people in the meeting, and you can even expand your set-up to two 12-foot tables if you wish. At 28 feet, you can move your conference to a medium-sized room that allows for more chairs, more table space and more comfort so people don't have to strain to be heard. Mute Functions and Omnidirectional Presence Each microphone has a mute button for privacy, and a mute indicator light shows that your group has the freedom to talk among themselves without the other side listening in. Otherwise, the omnidirectional microphones readily pick up sound from all sides of the room so every voice is heard clearly and distinctly.