ATIR-T85 is lavalier microphone for ATCS-60 IR conference system. These microphones are designed for use in presentation applications with the ATCS 60 infrared conference system. This system uses infrared technology for transmission, not radio waves, thereby eliminating signal transmission outside the room of use. Up to three presenter microphones can be used together with the ATCS M60 conference unit at the same time. For battery conservation, the power switch can be set to any of three output levels (ECO, LO and HI) as determined by room size.