The N-8020MS is an industrial-use master station that connects to an N-8000EX or N-8010EX intercom exchange by a single twisted pair wire. It is capable of full duplex hands-free or handset communication with other full duplex stations. The N-8020MS is IP54 for outdoor applications. It includes an external speaker connection (.6 W @ 8Ω) and a remote controllable open collector control output. External or internal speaker priority is supported. The master station may be wall or desk mounted