The OSL BCS - Business Conference System surpasses the industry standards in its ease of use, design & interoperability with the existing conference room ecosystem. The BCS Flush 1D is the flush mounted delegate unit for the BCS conference system. Its 3-pin mini XLR mic input accepts the BCS GN-18 or C Ray microphones. The chairman units have 2 buttons - Push to Talk & Override for a quick conference.