The Scott CON-SPACE LINK allows Scott users in confined-space operations to communicate hands-free through a full-duplex, hard-wired system. When integrated with any Con-Space Communications, Ltd.T hard-wired communication system, the Con-Space Link acts like a telephone conference call, allowing clear transmissions between entrant and attendant. All operations are automatic and powered through the Con-Space module. The only button on the unit is reserved to alert an attendant of an entrant`s emergency. (704) 282-8400.